This has some really fun mechanics, it's a shame you didn't have more time to balance it out. Still, by the end of my playthrough I was enjoying just tinkering around with different card combinations. As you can see in my screenshot below, I had started making an automated point generator setup. However, I started to have some visual bugs with cards doubling up in slots and drawing at weird offsets. The late-game stuff is really fun though, you could definitely develop something bigger with this.
The early game was a bit slow though, I'm not such a fan of putting a cooldown on a clickable like the draw and submit buttons; either clicking or a timer is fine but both isn't so much fun. Also, I wonder if the shop stuff could fit on the same screen as the play area, just to save some clicking in and out of them?