Simple yet entertaining. Brilliant art and sound as always! The challenge is there, and the play strategy varies between rounds. Awesome work!
Although I would love to have a twist at the end after you become the boss: an actual boss battle on the last level. Also, the gray patch on the ground is a bit too dark to imply that it's still a floor for me. It took me quite some time to realize that it's just a floor texture.
Still, it's a nice, polished game that I really enjoyed.