Feedback is a gift and this was an awesome one, thank you for detailed critique!!!
The last level was a bit of a last minute rush, but you are 100% right, I did not make it possible to win with the wrong cards which is absolutely a flaw in it's design. Hearing of your experiences with solving the levels with the "wrong" cards is great, and has highlighted how much I should consider these, and I'm quite excited about having this more in mind with designing levels!
Camera - wow, YES. I should have realised that as I was throwing the ball around in god-mod to see what was where. I wonder if a more traditional spread of the cards might work better, like fanned out at the bottom of the screen, and then being able to move the camera around would work, possibly even being able to reorder the cards in hand for those planned out sequences of moves.
Larger areas, also noted!
I'm glad you had some fun still despite the quirks - getting the end goal vortex will-it-won't-it-will-it working did feel like a littlie win, I'm happy you found that satisfying too! :D