Thank you VERY much for suggestions and playing. Yeah a lot of people said it's too hard and your idea for left (easier) room healing you more is actually really good. There is artifact you can buy called Restore UP that makes you restore +10% more HP at the start of the next level, though it's luck based. Also I was thinking about making the game roguelite, so you can have upgrades after each level, like permanent upgrades, though I didn't have time.
Also thank you SOOO MUCH for commenting on assets, I feel a bit more confident in Blender now :)
Good luck in game jam :D