Pretty cool idea! Is there a specific game that inspired the single turn combat mechanic? Slay the Spire and Monster Train come to mind for obvious reasons. As a fan of deck builders it's great seeing the genre get some love in game jams!
I like how many different card mechanics you designed - cool abilities and flavor to them. It did feel like there were many of them and going for synergies was not a very effective strategy as it was difficult to pick many cards that would go together. I ended up selecting all around good cards instead of ones that relied on combos. Maybe introducing different families of cards on different runs to help the pool of cards be smaller in each run could've alleviated this issue. Tricky with the jam deadline I know.