I enjoyed it a lot! There's great visual and audio polish: music, colors, moving background, SFX, screen shake... I'm taking notes to try to bring more life to my future jam entries! :D
My only suggestion is to lean into the "card" theme a little more, if you'd like. For example:
- aesthetic: choosing a card (highlight chosen one, animate it), drawing cards (SFX, animate)
- mechanics: could make it clear there's a deck that you're choosing from and there's some math/odds involved in what's coming next.
p.s. I was surprised that the pieces on the card != the color of the pieces in the gameplay. In the screenshot you can see red for the "z" shaped piece on card #2, yet the one in the game is yellow. It would improve cohesion if my chosen piece looks exactly like the one entering the tetris arena.
Thanks again for sharing your game!