I can see this demo (which is to release on Steam when Dev has a more finalized product, according to the itch comments) becoming something truly awesome!

I can say that after the initial shock you have of trying to really get what's going on here, it's amazing. It feels wonderful to play, progression isn't awful and the card pack aspect of it is an amazing twist. I found myself hooked into each next run, waiting to see if I unlock a new card pack or anything! Fantastic!