Fun game! ^^
Got to level 25 before stopping. Mechanics are solid and gradually watching your armory of abilities grow as you continue is a nice sense of progression. :) The Shield person is a little OP imo, but other than that, not really many complaints.
I feel like this gameplay has amazing potential if you continue working on it! The game is solid as it is, but there's so many cool ways you can implement new ideas/enemies/levels/whatever in the future that I'd love to see more of this! :D