Really really nice game! I loved the artwork and the game design. Also the idea and the way you managed to implement it into your entry are extremely well done. Congrats!
There's a comment down below by Dr Umbrus which has pretty much every possible improvement I was going to mention, so I won't repeat it. Apart from those, I did find it way to hard to start playing and get used to the game, maybe a deeper tutorial to make it easier for dummies like me would be nice lol.
But still I loved your game and it's definitely a top entry for me, good job and keep it up!
Also would really appreciate if you could check out my game and leave a rating, thanks :)