It's a throwback to Gradius III (well, that's what i was going for at least). Basically, the UFOs keep cloning until you get 3 kills. Then you have to kill all of the remaining UFOs on the screen to get to the "Boss Level". The boss pretty much fades in and out, grows and shrinks, and multiplies itself, but you can't actually kill it.
Spaceship was a free download from: https://www.festivalclaca.cat/maxvi/TJRbR/ Play Now icon was a free download from: https://dlpng.com/png/6606940 All UFOs were parts of the Creative Commons 4.0 BY-NC License from: http://www.pngall.com/ufo-png All sound effects were open source from: https://opengameart.org/content/512-sound-effects-8-bit-style Game music courtesy of Eric Matyas from: https://soundimage.org/sci-fi-4/