Wow, really great game. Maybe you could make the first level a little easier and create something like a tutorial as an introduction. That way, players don't have to study which keys to use during the game, and you force them to use them right away.
Glad you enjoyed it! The game only has the one level, and we didn't have time to build out a full tutorial to walk the player through it. We did out best with that little tutorial screen at the start but I guess it needed a little more to it.