I'm on mobile (decent hardware) and game runs at < 1 FPS. Did you upload a Debug build?
No, in fact I even optimized beyond probably every other submissions using `-o3` rather than `-oz` and the binaryen `wasm-opt` tool (see The build script). I was myself experiencing slowness, so I made sure I put all the optimizations I could think of. I imagine you already tried disabling lights using the main menu "disable lights" option, this would me my first guess at a source of slowness on mobile. Otherwise, you are not the first to report unplayable frame rate and I need to run the game through a profiler, my best bet is physics if it's not graphic related.