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Very nice Game of simulate gravity force in university. Also your game reminds me of my summer online course "Attraction and repulsion Force"(I have attached the link you can glance it). But that video used P5.js your physics engine used C# perhaps. 

Also I am real like your mini UI elements and the hold the power bar. Very nice user experience. If you can add more repulsion force or other forces inside this game, It would be more places to play. But I can see many potential in this game and in your!

Attached link here~