Things having been done by me.

Wrote basic top down shooter. Ran into runtime limits at about ~50 entities onscreen. UNACCEPTABLE.

Wrote a preloader; restructured entity classes to be more generalized using pluggable behaviors and preloaded sprites, and restructured the main loop to be further optimized.

debugged, ran into runtime limits between 100 and 200 entities onscreen. UNACCEPTABLE.

Looking at writing better collision detection once I perfect simultaneous multiple type bullet emission.