Hi - thanks for the feedback! Apologies for the build not working out - this was our first time working web build stuff so we're still figuring it out as we go. I'm unable to re-create memory runaway issues on Firefox or Chrome, but the game is using Unity's experimental WebGPU backend, so it's possible that vendor specifics might be contributing to some of the issues.
We just updated the web build to strip down some lightmaps, should be around ~30% smaller now; if issues still persist, we might try adjusting some render features and moving to a standard WebGL build. Thanks again for giving it a look!
UPDATE: Was able to re-create what you were seeing by forcing usage of the WebGL API, which Unity would fall back to if WebGPU was disabled. Going to spend some time debugging this and see if we can get a fixed build up. Thank you!