Castle Cat for the Sega Genesis is a homebrew port of the Flash game of the same name by the late Felix Wiesner. It is the first game starring the titular Castle Cat, a cat with a head that resembles a castle battlement and contains a loaded cannon and lots of maces. In this more relatively grounded installment, you follow Castle Cat as he climbs up a tall castle and battles the dragon at the very top, all the while fighting off knights, whirlwinds, and jesters.
Spikestuff and LoganTheTASer work together to get to the top of the situation and take down Godzilla dragon (not Ghidorah) in record time.
You can get the game here.