Some things about the gameplay:
- The friction is too low, causing me to slip off platforms, which is annoying
- I don't see any reason to map the high jump to a different key instead of just holding/releasing the jump key
- The backtracking quickly got annoying when I go to the Tower
- The black critters should have an outline to make them more visible
- When you go to one of the rooms in the Tower, there is a pit of spikes in front of you that's just unexpected
Also, how the heck did you manage to make a font with just 3x3 pixels??? I thought that 4x4 was the absolute minimum.