Argh! I got to the part with the spikes!! I love this, the game is very polished, I think you could expand it much further with more bosses!! I played with the mouse to attack and couldn't check right now if it works with controller, but It would be nice.
The music is good, the sound effects are good as well, and the sprites and animations are very well made. Overall, this is certainly a very strong game that could be expanded a lot! Congratulations, be proud !! :D