That's a neat game! Any game is always made better by the addition of jetpacks :P If you wanted to add another dimension to things you could have the characters use their jetpacks to move up/down. At the very least it would give the player something to do when an enemy shoots them, since it seems right now that sometimes you just get blindsided by a perfect shot in the first second of the round. Not frequently, by any means, but it could be a bit of a bummer if it happens late in a run. Overall though, I liked the game and the novel take you had on the theme, incorporating it into the control scheme.