@Green Meteor Team thanks for your comments and I agree that adding wheels is a bit to harsh but as this was entered into the Invention Competition I didn't have time to properly tweak the power/weight ratio so once the competition is judged I will start tweaking it.
The idea behind the game is actually to create wacky designs so this issue kind of defeats it.

"Be creative" is actually the only level that really forces you to do something different and your solution is pretty good. I've used more wheels than that myself to also steady the vehicle :)

The level editor should not be available so that's a clear bug, thanks for letting me know but I have to wait until the judges are done. It's removed on my site though.

Dirt/slick also seems like a bug will look into it and fix it.

Thanks for the feedback and kind words!