Hey! I recently released a set of Galaga ships. These were just meant to look cool and aren't exactly practical. I decided to also make a set of Galaxian ships. Galaxian being such a similar game to Galaga, I just did the same thing. The aliens in game are just recolors, so I made their engines get slightly more powerful throughout the ranks.
Any other games you want me to do? Maybe Xevious or Centipede?