The main issue that made the game laggy and felt like it crashed were the GPUParticles3D, which I turned into their CPU counterpart now.

Also, the normal version for downloading is not affected, so I didn't change anything there, but the fallback versions are now using the CPU particles as well, in case someone has a weak PC

The web version still has a tiny bit of loading lag at start, around 1-2 seconds, but I think this is normal.