A neat little game for a quick session. I didn't notice any major bugs while playing, which is impressive given the short timeframe.
Quick question: Do the cards regenerate from scratch with every move, or is only the used entry removed from the array while the rest shift down / get refilled? While playing, I felt like they were being completely regenerated every time.
I think it would be even cooler if the cards were generated, but all currently available cards on screen stayed put so you could use them more strategically. That way, you could plan routes and use the cards tactically to finish the level in as few moves as possible.
All in all, a great jam entry!