Nearly there...2 days left, and I finally have something playable!
It's still running a bit slow, and I'm running out of optimizations. Tomorrow I plan to change a large amount of my per-pixel alpha channels into colorkeys in the hope that'll speed things up. Also in the pipeline are difficulty/display options as well a few tweaks here and there to the gameplay. If I have time I might even add a few graphics (currently only using one cloud texture for example).