Ideas! :D
First of great game I love it but I got some ideas that might help you.
1. Trash can. If you put the objects in here they will be deleted... If you pick the wrong object in this version you can't get rid of it.
2. layers. As you have that cool rotation why not have layers for example if you hold up and click an object it will be moved to the layer above it if there is one and reverse if you hold down and press.
3. More charcters. I got alot of em'. Here's a great link to the main storage of spritesheets.
4. customize able music it would be cool if you by pressing 2 get another music and the same up to 9 or something like that. can be short loops just so that you got more then one track becuse it can get annoying!