I like it very much. I think I would make it a little bit faster though. And as others mentioned controls are at first a bit confusing.
With a little bit of polish I would leave it as it is, and make it into some kind of missions or stuff like that. And similarly to games like Desktop Dungeon/Downwell give the player experience after each session and unlock like new stuff/upgrades/options/configurations to make it easier the more You play.
Good job, I hope You'll continue.