UPD: There is a fixed version for PS2-POPS emulator. It's experimental build, so you can find it in our discord server.
The game is developed for PS1 or Duckstation, so PS2 compatibility is not a priority, so play at your own risk on different platforms or emulators. But still, if you'll find some glitches (any platform or emu), there is a special channel in our Discord group where you can demonstrate the problem.