There should be a Controller in the shop: 50 coins to be able to control both your main cube and all other objects of your choice. (i.e. have a shape controller selection screen, and choose which ones you want to control from that list.)
Or something like that.
Can we have an, "Are you sure you want to sell this?" button? I don't want to accidentally sell something valuable when I meant to click an invaluable thing. (I'm sure other people have experienced this)
I think it would be cool to reward players for creating highly-rated levels :D Say you get 50+ rating on your level, you could get like 5 coins, 60+ rating, 10 coins, 70+, 15 coins, etc. Or something like that. I haven't thought much into it.