The fact that it crashes randomly makes me wonder if this was even tested before being put here.
Somewhat fun otherwise, gameplay reminds me of an old NES game. I think it was called Bonk's Adventure or something similar; you use your head to jump in enemies and kill them. A lot of the levels are trial and error ;enemies popping out without you actually having time to react to them (first time happened in the first few levels where a green thing stomps on you out of nowhere). However the only reason I'm writing this is because I had yet to see a flash game randomly crash / lock up. Some of the coding really needs to be checked.