Wow, that's further than I thought anyone would take my prototype! Great feedback, very much appreciated. I certainly agree about the balancing, though I've got lots of ideas to improve that.
Yeah, the cooldowns on the draw/submit was to try and encourage the player to slow down and think, but it only makes sense to do so when you have at least a few spots on the board. Originally you started with 4 slots and a multiplier card, but I wanted to try and re-enforce the incremental aspect. It didn't work out, and if I work on this further, I'll definitely be leaning away from the incremental aspects aside from the incrementality of improving your deck.
Bringing the shop out onto the board is great feedback too. Really appreciate it :)