I made this little game in late 2008 through early 2009. It was my first big-ish project in flash/AS3 and wasn't intended to be all that ambitious. I ended up spending a lot of time polishing it and adding levels/content though.
The graphics are quite simple and most of it is derived from a very small set of tiles I drew at one point, though color-modified to add variety. I think it ended up being relatively effective.
My favorite part about the game is probably the music, and how the gameplay turned out rather fluid and enjoyable once you've got the hang of it.
I still haven't spent the time to earn every single achievement trophy, but I probably will some day. I have one friend who I know did it in a late beta version, so at least it's possible.

Enjoy!