Interesting blend between platformer and card game. Its an interesting positive feedback loop where taking damage compounds the difficulty, thus, gives lasting consequences to being hit or missing a jump making it more difficult to progress. The art is very pleasing, really liked the run animation for the character and the overall design and mostly grayscale palette. I also really liked the way the Holy Rain card looked, super cool affect
I do think that the camera is a bit too high up. Jumping down to a platform below you is a leap of faith and makes it frustrating to get hit by enemies you couldn't have seen. I think the curse's effects turning off after a set time dilutes the utility of having potion cards; the player can simply wait out the curse.
Had a lot of fun with this! I would love to see this concept pushed further with more enemy types more card abilities and maybe a way to build your deck. Great job on this!