I experienced similar frustration using Emscripten to ~port a simple C+SDL2+GLES2 game to wasm. While it mostly worked, it wasn't a very polished environment a

I experienced similar frustration using Emscripten to ~port a simple C+SDL2+GLES2 game to wasm. While it mostly worked, it wasn't a very polished environment and how well it worked depended greatly on which browser was used. And even in the best case there were still annoyances surrounding things like fullscreen handling. It all echoed of 90s-era web development when we had to test every browser and kludge browser-specific exceptions due to incompatibilities. It's been over a decade since I cared about web stuff, so maybe this is just the way it still is in general and not just emscripten/wasm support. Whatever the reason, it didn't inspire much confidence to rely on this pipeline for delivering native+web games to the masses in a single implementation.