SPOILER ALERT! SPOILER ALERT! SPOILER ALERT! SPOILER ALERT! SPOILER ALERT!----------To get 100%, buy 2 engines upgrade full, buy 2 magnets upgrade full, buy 8 missiles upgrade full, buy everything at the shop (including mystery upgrade after you beat level 20) buy good ending. Vote down if you think this is a spoiler or if it helped.
There's a bug on level 6 that won't let you activate the switch...no matter how many times you...bump/ram/run into it, can't really share the same hatred at the last level others have until it's fixed. Other than that it's an okay game, I thought the ball's tail was cool.