There was some sort of bug in the last level - it made some pieces stick together only sometimes, and some pieces that weren't next to each other stick together
It would be nice if the coin density was as high up high as it was low down. I find it's easier to just go slow at the bottom kinda skidding along the floor to gain tons of money. Also, more upgrades please.
any time you want to purchase an upgrade, get your money back first, to prevent accidentally buying something higher that won't reimburse the lower upgrade.
could be improved by allowing drag and drop movement of pieces. It's pretty easy to move any piece wherever you want, but gets somewhat obnoxious after a little while. Maybe also add option to increase speed significantly.