I enjoyed this game! While it lacked polish in some areas, the gameplay felt good and I enjoyed the variety of enemies and weapons. I think my only criticism of the gameplay would be the additional abilities, the spin and the shield. Perhaps I don't see the utility, but the spin felt very underwhelming to me. It was difficult to reflect more than a single bullet with the spin and I felt like my time was better spent shooting since you get locked into the animation. The shield on the other hand felt overpowered, especially during the boss fights. The fact that you could leave shield as soon as you want made it by preferred defensive options (besides dodging).
Either way, I enjoyed the game quite a bit. The anthropomorphized trash as enemies made me laugh in a grim "we're killing our planet" sort of way, and the variety of enemies was really great (even if a lot of them were palette swaps).