Here are some of my AWESOME ideas...

The flora editor. You can acess a very buggy and not much fun flora editor but the best you can make is a blob with green spots. So maybe there could be a WORKING flora editor...

Aquatic stages. There should be an option to stay in the water or go onto land. In the water the controls could be much like the space stage scroll up and down to move up and down. Arrow keys or mouse click to move.

Lan/Buddy multiplayer mode. There could be another option after Galactic Adventures tab called buddy play where if your buddy is online you can play a co-op creature-space game and help each other take over the universe. You could write messages to each other and in an Adventure you could get an invitation to help out but if one of you dies you both FAIL!
These are only some of my ideas that I can think of...