The concept is really neat, the idea is great, but evading the enemies as a whole is just much easier and better for recourse management than attacking..
The art style is brilliant, along with the music! As a whole, the game looks and sounds really nice. Only small complaint I have with the presentation is that the background made it a little difficult to concentrate. Making the stuff in the back slightly darker or such would help with that.
Plus, not to forget the achievements! Really good addition. Honestly just a really cool game overall.