I'll See Your Red Dwarf and Raise You a Black Hole
In the aptly named Solar, you play as a wandering star. The universe is filled with debris such as asteroids, planets, and other stars. Passing by a planet at the proper angle causes it to be sucked into orbit. Running into things (asteroids, planets, other stars) causes you to lose mass while absorbing items from your own system causes your star to gain mass--eventually turning into a black hole. Just as you can suck planets...