It is a great game, but at times it can lag on itself with too much going on because the turrets would constantly fire and go on and on and on. It did this for 2 levels I know about.
Also, when you are firing and walking or jumping you can actually die by your own bullets. This became very irritating when I would be acing a level then all of a sudden I jump while shooting and go poof.
The ending was a major letdown, while cute it offered no way of actually finishing the game for a small cut scene, credits or anything.. it just says game over. I was hoping for a boss, a moving enemy of some kind.. or at least "Game Over" but a possible way to beat it. Consider revising it to make it possible, or make the game over out of stars or something quirky.