Thanks Daniel, really pleased you liked it! Much of the art was placeholders due to lack of time, though we're really pleased with Brian as a main character. :)
I've seen other people react the same way to the missile, so I think you're right that it's not clear what to do. Maybe we'll make the missile into something you do have to slide under in a future release, and use something less deadly-looking as the speedy airborne enemy.
Sorry level 2 didn't work for you! Though most people seem to have had no problems playing, we have had a couple of other reports of mysterious bugs. Unfortunately I've never been able to replicate them here - one of the hazards of writing a native browser game I guess!