I reuploaded the game with potential fixes, and I asked a friend to run it on Firefox, Linux and it worked. If it still doesn't work I assume you aren't up to date.
Still black screen after Unity logos.
found this in console:
An AudioContext was prevented from starting automatically. It must be created or resumed after a user gesture on the page. GoVT.framework.js.br:10:52096
also, a lot of these in console (added stacktrace):
NullReferenceException: Object reference not set to an instance of an object.
GoVT.framework.js.br:10:37541
_JS_Log_Dump https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
<anonymous> https://html-classic.itch.zone/html/12278217/Build/GoVT.wasm.br:5495061</anonymous>
<anonymous> https://html-classic.itch.zone/html/12278217/Build/GoVT.wasm.br:1318058</anonymous>
<anonymous> https://html-classic.itch.zone/html/12278217/Build/GoVT.wasm.br:10386690</anonymous>
<anonymous> https://html-classic.itch.zone/html/12278217/Build/GoVT.wasm.br:5494758</anonymous>
<anonymous> https://html-classic.itch.zone/html/12278217/Build/GoVT.wasm.br:172476</anonymous>
<anonymous> https://html-classic.itch.zone/html/12278217/Build/GoVT.wasm.br:3158853</anonymous>
<anonymous> https://html-classic.itch.zone/html/12278217/Build/GoVT.wasm.br:367358</anonymous>
<anonymous> https://html-classic.itch.zone/html/12278217/Build/GoVT.wasm.br:224959</anonymous>
<anonymous> https://html-classic.itch.zone/html/12278217/Build/GoVT.wasm.br:4574908</anonymous>
<anonymous> https://html-classic.itch.zone/html/12278217/Build/GoVT.wasm.br:14054806</anonymous>
<anonymous> https://html-classic.itch.zone/html/12278217/Build/GoVT.wasm.br:6226202</anonymous>
<anonymous> https://html-classic.itch.zone/html/12278217/Build/GoVT.wasm.br:11037400</anonymous>
<anonymous> https://html-classic.itch.zone/html/12278217/Build/GoVT.wasm.br:5816447</anonymous>
<anonymous> https://html-classic.itch.zone/html/12278217/Build/GoVT.wasm.br:5816558</anonymous>
<anonymous> https://html-classic.itch.zone/html/12278217/Build/GoVT.wasm.br:10366398</anonymous>
<anonymous> https://html-classic.itch.zone/html/12278217/Build/GoVT.wasm.br:10246998</anonymous>
browserIterationFunc https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
callUserCallback https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
runIter https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_runner https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
(Async: FrameRequestCallback)
requestAnimationFrame https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_scheduler_rAF https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_runner https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
(Async: FrameRequestCallback)
requestAnimationFrame https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_scheduler_rAF https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_runner https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
(Async: FrameRequestCallback)
requestAnimationFrame https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_scheduler_rAF https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_runner https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
(Async: FrameRequestCallback)
requestAnimationFrame https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_scheduler_rAF https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_runner https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
(Async: FrameRequestCallback)
requestAnimationFrame https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_scheduler_rAF https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_runner https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
(Async: FrameRequestCallback)
requestAnimationFrame https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_scheduler_rAF https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_runner https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
(Async: FrameRequestCallback)
requestAnimationFrame https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_scheduler_rAF https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_runner https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
(Async: FrameRequestCallback)
requestAnimationFrame https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_scheduler_rAF https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_runner https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
(Async: FrameRequestCallback)
requestAnimationFrame https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_scheduler_rAF https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_runner https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
(Async: FrameRequestCallback)
requestAnimationFrame https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_scheduler_rAF https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_runner https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
(Async: FrameRequestCallback)
requestAnimationFrame https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_scheduler_rAF https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_runner https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
(Async: FrameRequestCallback)
requestAnimationFrame https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_scheduler_rAF https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_runner https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
(Async: FrameRequestCallback)
requestAnimationFrame https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_scheduler_rAF https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_runner https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
(Async: FrameRequestCallback)
requestAnimationFrame https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_scheduler_rAF https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_runner https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
(Async: FrameRequestCallback)
requestAnimationFrame https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_scheduler_rAF https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_runner https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
(Async: FrameRequestCallback)
requestAnimationFrame https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_scheduler_rAF https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10
Browser_mainLoop_runner https://html-classic.itch.zone/html/12278217/Build/GoVT.framework.js.br:10