I love games like these, I have played lots of games that are similar to this. Definitely going to be a good game to pass time. I wanted to play it even more, but after the 10 mins, the game is no longer playable. From here, i think you can definitely improve this a lot. You can add more enemies, more powerups, and more cards. I can't really get my head around the loop concept though, but that's just me. Overall, fun game. Keep it up!