Good idea. I did not realizing i hit the goal. You should make all important things as a functionally visible (= goal looks like a goal, players look like a player, etc.) Characters are fun, except large physic ball does not seem to fit with tiny platform characters. Theme here instead of over all, fits perfectly. If you make an android version or other pc- version from this project, it would be nice to have Drag&Drop-featured in to this.
If it's stressful to make new projects, you can thing every build you are on to are prototypes; it has to not to be the final product; even Minecraft was a prototype once, which is a good review how most popular (and usually most successful at the same time) games and projects has a simple setup and fine release. There are no ready-up games, because nobody actually knows what people want to play or what they want to do in the game. Instead of games, some people draw cartoons or write on a magazines, and somebody tell them "hey this is nice, you should view this to the others and maybe sell something like this by making it more". Don't make worry about your game, and don't add your worry in your games either.
There are also some other nice game creation platforms than Unity. It is not the best while you need to learn many things and it is massive software. Maybe you can find a team.
https://www.gamedesigning.org/career/video-game-engines/ There are some game engines revealed on this web page; I would recommend to use Construct 3, it's simple, but at the same time it's not as that expanded what i.g. Unity is.