You're The Core

You’re the Core is a top-down, tower defense, and real-time strategy (RTS) game set in the distant future. The player controls a single huge object, a Dyson sphere, which is a theoretical object that surrounds an entire star to gather energy, or provide living space for a far advanced civilization.  The player upgrades and controls parts of the station to scan for and defend against enemies, and manage the energy the core needs.

NOTE:  While asteroid spawning does work, it's way too slow. Slow enough to probably never lose. While it is technically possible to lose if all 12 sections get to 0 (or negative) health, it would likely take days. This is not intended, but at least it serves as a proof of concept