I want to start this off by saying I really liked this game. The art is wonderful and adorable and I'll always enjoy 2.5D things like this. The character dialogue was funny and each of the characters felt like they had a lot of effort put into them and their personalities even if the conversations with them were brief. It's cute, it's action-packed, and it's fun!
While it was hard at first I did find out that the game can actually be cheesed in a few spots pretty easily if you hold down the fire button, most of the bosses has a spot where you can simply stand still and hold the button without getting damaged enough to die, and that made beating them fairly easy at times, even the final boss suffered from this as I was able to beat them without moving too far from the spawn position. Although ignoring this since I know it wasn't intentional, the game can be pretty challenging and rewarding when played correctly, (I.E. moving around, dodging bullets, getting rid of the lil' minions, etc!)