What a great game! Some things I appreciate about it:
- Immediate player control
- Clear progression and objectives
- The movement feels great! I love just jumping around!
- Combat feels tense and ties into mechanics
- Colorful, atmospheric graphics that aren't in-your-face about being low-res and retro
- Linux support
These are the building blocks that pretty much every fun game nails--and what a sense of style it has too! Pretty rough around the edges, but extremely solid work for what it is.