Hey, thanks for testing it on Gopher64 and letting me know! That's really helpful feedback.
The demo relies on high-accuracy emulation, which is why it might crash on some emulators. For now, it's confirmed to work perfectly on these setups:
Ares Emulator (on PC)
Original N64 Hardware (with a flashcart)
Analogue 3D
MiSTer FPGA (N64 Core)
Thanks again for taking the time to report back!