Lol the clipping and jumping and refusing to push issue has switched from the coins to the larger objects because the coins are too heavy relative to them now. Instead of pushing the coins, the larger objects tend to clip into the coins and then surface to the top like they're floating in a liquid. I still find this more fun than the other way around, though. (This DOES result in bonuses becoming a little more lame as they don't result in massive coin pushes but rather get pushed onto the top of the sea of coins and sometimes just jump straight into the edge)
thanks for the feedback, I'm still a bit of a programming noob so learning as I go but I found the issue and yeah some of the props had the incorrect mass settings applied but it should be good now. They are also based on the item so a green herb is much lighter than the unicorn medallion etc.
Also fixed the issue with spacebar not working after clicking buttons.