The things I'm particularly proud of:
- It's cross platform: Windows, Mac and Linux. Android will follow.
- It has all Steam recommended features: achievements (only 8, more will follow), trading cards (almost), and cloud sync of your savegame.
- Maps are procedurally generated. Each time you play, you have a different world and different maps.
- I absolutely love the music: it's amazing how much it adds to the gameplay and atmosphere.