I really liked the idea of the companions who fight on your side which have different abilities, that heavily reminds me of the game "The Binding Of Isaac". I can only agree with the others, that the atmosphere was nice and the art style was clean, it is a nice short challenging game.
But I must say that I had a hard time figuring out how to bypass the spikes, or that you have to shoot some enemies more often until they die, I just thought there was some kind of obstacles, a little feedback when you hit an enemy would be great.
But overall it was a nice fun game :)