Oh, and I forgot you wanted to know what future content I would want in a full game! I think maybe moving the goalposts over time? Like "You've made it to low-Earth orbit, now shoot for the moon!" and then scale up the required velocity and angle needed. Speaking of angle, maybe it could be cool to let the player decide what angle they want to shoot out from? Idk if there's a guaranteed-best angle that would negate the point of this (although maybe you could get around this with obstacles or wind that changes every attempt) but I'm always a fan of giving players more decision-making opportunities.