itch.io

Unfortunately I don't have at hand atm the source code/file to know the cause of this bug and I couldn't replicate the bug on my emulator. If there's some movement of the "camera" when you move the invisible character try pausing the game and resume it, especially if there's a chance your character is outside the checkpoint trigger area. 

I'll include it in description, thanks for pointing out:

Standard WASD for movement.

For Select: Press Shift

For Start: Press Enter

For A: Z or J

For B: X or K

If the error is taking place within a checkpoint area could you specify which particular checkpoint is that? Does that error "solves itself" if you open the options' menu and then continue the game?