Your game is great, seriously. I'm sure I would have played it for hours as a kid :P
Maybe it's just a skill issue, but I felt like the difficulty curve suddenly skyrocketed, and I couldn't get past level 6...
Great job!!!
I was in a rush at the end, so I suppose I didn't spend enough time smoothing out the difficulty. Level 6 was the last level, so you didn't miss anything after that other than a "mission complete" screen.
Thanks for playing!