The arena feels super small, bosses are right there in your face.
The bosses aren't hard, but there are lots of them and that's cool.
The movement of the bosses is super simple, but their attacks are neat, there are some good attack patterns there.
The game does lack on the visual department.
You might have problems with the music, being copyrighted and all that, The sound effects were a little too loud I thing, or they were a little saturated.
I did have fun with the game, I beat like 5 or 6 bosses, they went so fast I didn't really count how many. But After dying I didn't feel compelled to keep playing