Thank you so much! Your feedback is highly valued. We'll work on implementing them the next update.
Some points:
"during play the cards that are already clicked can't be retracted :( dunno if that's intentional"
Yes, it's intentional. It's seen as some kind of a punishment for the player. Perhaps a powerup that lets you remove the cards can be cool, not sure yet.
"like wdym a few minutes; a session took me like an hour 😭"
Haha! by a session, we mean a single level.