Hey, the game is really fun, great work!
Having worked on my own card games I have a special appreciation for the great card feel. Dragging them around and playing them feels very satisfying!
I noticed a few things that you might or might now be aware of:
- The player doesn't get to see the card they receive from the altar after sacrificing 3 cards, which doesn't feel right
- I can sell the Curse card for money (this might be intended, but I was surprised)
- Baby spider's textbox is "No additional effect", I think it's better to just leave it blank then
- There was a typo at the end: "Game Overe". Yes I lost in stage 3 :')
Overall great job, excited to see where this goes!