Fun idea
Unfortunately, one that's hard to implement without it's loop arounds :P
I was able to beat this the first time through without losing once, unfortunately the last boss seemed to be the easiest fight of all.
This was mostly because I timed hitting space bar and left right (simultaneously) so that I could never be hit, but was hitting them twice atleast once a second.
I retried the game, and the upgrades really didn't help. It took longer w/out the power, and Im sure if I let either of the last two fights hit me, I would have been one shot, but none the less.
However this is a flash game, and one made off a fun childhood toy which didn't allow for any further difficulty to be added without being made possible, so I definitely rate this a ten.
10/Music
10/Camera
10/Animation
10/Idea
10/fun!