Really solid submission. I love the art and music. The gameplay is simple and easy to get along with - not much thinking required, which imo makes it so much more enjoyable. I like the amount of content in the powerups with the cards, and the bosses are fun to fight, with the little dialogues after. The only points I have, are that I'd like to see some variation since the gameplay loop is kinda the same, and maybe stage designs so its not just moving around in an empty box.
Other than those two small things, I loved this game, very well done!