Fun idea, but kind of maddening that I can click and hold to add mass to a hole but if i overshoot, i can't do anything subtract mass or delete a hole.
The ability to subtract mass is definitely needed. All you can do is click “undo” and try again. You can drag the holes around too. Still pretty fun, I played 5 or 6 levels
Another alternative is to make it like a turn-based Scorched Earth (Mother of all games), where you can either
1. launch asteroid size projectiles across star systems in a field of stars and black holes to it each other.
2. launch projectiles that then place black holes (perhaps either by timeout or signal--taking into account the speed of light!) to change the field.
It's a good start!
It’s a mobile world. This would be so nice as a proper touch enabled game