There are a number of issues I ran into:
- Some slimes turn upside-down when moving left.
- Many fly enemies in the second level are too close to the floor to pass under, but also too close to the ceiling to jump on/over.
- The lose sound effect plays multiple times when you die.
- Music does not reset after death.
- Switches and switch-blocks have missing graphics.
- Jumping in mid-air causes the sound effect to play multiple times.