I will go against the crowd and suggest that you just keep doing what you're doing. Forget about "making it fun". Even in these rough demos, the various parameters and behaviors you land on clearly shows a natural instinct for it that you can trust. Forget about "making an actual game", what you're doing is magic and the more you do it, the better. You've got a gem here. It's already insanely valuable. Keep polishing it, and the world is yours. Keep this up, as long as you can. The "last mile" is going to be easy for you.
Thanks! It goes against "common sense" but you might be right. Sometimes the formula for success is that there is no formula. To quote myself from a prior tweet, "Success is what happens when hard work meets a stupid idea. Every idea looks smart in hindsight, but the good ones look stupid in foresight."