Thank you, I'll definitely add more stuff later once the jam is over, I'm actually working onit now, I have a lot I want to do.
You don't get any rewards for saving coins sorry xd, but you can keep them once you beat the game and use them in another playthrough(you lose them all if you close the game tho, no save system xd). Also I'm curious: did you find any of the coins and hearts hidden in rocks that you can break with coins? Or did you find the two parts where you can skip fighting with enemies by jumping on top of the walls?