This is a really tight little game! Solid design, very reminiscent of the ancient vidya days.
Difficulty - Text says I get two actions to every one enemy - I found I only got one action per turn. Making it impossible to win (at least so far).
Ability guide - I would really like descriptions of the powers, maybe in external text. It is fun to discover them though, there could be a list sort of like cheevos so you know if you've seen them all, and the descriptions unlock. Also more explanation on doubling - do different powers double differently? Triple?
Cram more - I'd do a separate game if you want to put more in, and give it a punchier title. This one's pretty excellent as-is but the concept could definitely be expanded.