Amazing game! One bug I've found is that the apple a day sticker sometimes doesn't apply base mult on the first turn of a round. And I think there was another sticker that did that too. So there seems to be something going wrong with first turn base mult.
Also starting new games is a bit buggy - sometimes items left in the sell box stay over to the new game, and occasionally I've kept a sticker! Sometimes, it starts the new game in the rebuild menu, or just straight into the new game (like the shop is open, but I can still click to launch a ball and it counts). So theres something buggy there.
As for the actual gameplay, my biggest critique is the balancing. I think steels are too overpowered and come up too frequently in the shop compared to say, vampire or stone items. It seems like betting on steel early almost always gets you to round 17,18,19 ish.
Really cool game, I've wishlisted this on steam and can't wait to see where it goes!