Great work! I'd love to see a more finished version.
The combination of card game and bullet hell is really interesting; definitely reminds me of Undertale. I'm not sure if I ever fully understand how the card game section worked though, particularly what it meant to use card / send card. The bullet hell patterns were really pretty, but some of them seemed too small so you could avoid them just by standing at the edge of the screen.
My favorite part was the art style—it's super cute!