@countroo1 That would sorta ruin the game. If they put an undo button it would be more of a trail-and-error game, and not a puzzle that you have to think about and plan ahead. Also a very important part of the game is the timing. It would totally mess that up too. Think about it. ;)
An awesome upgrade game. Only two thing that I have to complain about is the off course, and every now and than the rocket gets forced over there. Other than that it's great. I'll be keeping an eye out for a second one. 5/5
If you are experiencing lag Atom, you could always reduce the quality and right click, setting, and increase the amount of information Kongregate can put on your computer. It should make it less laggy. :)