The game is controlled with the [WASD]/[arrow] keys to move and jump along with [Ctrl] or [Space] to interact with the environment. A balloon appears above Dave's head when there's something to look at or someone to talk to, and even though every balloon doesn't necessarily progress the game, many offer clues you'll need later on, and some are just plain amusing.
So if the philosophy and plot behind this adventure game is so predictable, why a full review? Well, the artwork is reminiscent of Commander Keen in all its pixelated glory, and the animation is hilarious. It's almost worth it to get killed because it's so funny. The puzzles sort of make sense, and there's a nifty sense of achievement in working out how to beat the final boss.