HTML5 build does not work
The game crashes on trying to enter the game from the title screen.
Console shows RuntimeError: float unrepresentable in integer range
I think this means a float either isn't being initialized or possibly isn't OK to be implicit cast to an int. Some entity x and y coords are floats (to support angled movement) and it might be these.
Several Google results like https://github.com/Tastenkunst/brfv4_javascript_examples/issues/34 suggest this can be avoided with a WebAssembly build option, but that can't be changed in this project (https://emscripten.org/docs/compiling/WebAssembly.html#binaryen-codegen-options).