I'm glad people are picking up on the Vampire Survivors inspiration. I did originally want to have a wider selection of cards and unlockables and such but I really ended up scrambling with the time constraints, so perhaps I'll end up adding those later.
You're definitely right about the UI. The first version of the UI that I had started with started to feel natural since I was using it every time I tested the game, but in retrospect it is definitely quite clunky and unintuitive. I plan to do a UI overhaul at some point in the future and I will definitely be looking into implementing your suggestions :)
You're also right about the abilities... I'll definitely be looking at buffing them soon, since the original idea was that they would be on par with weapons in terms of usefulness. I originally intended there to be enemies with different attack patterns so that health and armor would be more valuable stats, but I guess they ended up not being too necessary in the final version.
Anyway, thanks for playing, and thanks so much for the feedback :)