Thank you for playing. Some of the balls are tied to some stuff for their size, but I think the coin could be a little bigger, due to the animation it has. I think it could be cool to add upgrades in the future with a second screen to go to to see the upgrades. I'll 100% think about it and see how things go before adding it, since it would require adding a bit for it to work well and to maintain some sort of game balance.