Very nice concept, and really good implementation!
I liked the music and the simple yet effective pixel art style.
Have to mention that the last level was very hard and challenging, but after few tries I managed to get to the end of the game :)
Happy that you endured and finished !
Thanks for the feedback !
Ps. There is a hidden easter-egg in one of the earlier levels
Ps2. If you finished , consider commenting your score at the game page :)