Ooga Booga! from y2kode - 2nd Version by Kaneda (Public Domain) - Genesis - Arcade

Homebrew run-and-jump platformer, loosely based on the game Ooga Booga released on Dreamcast, where you control a caveman as the main character. The author did his best to use all the features of the Sega Mega Drive (except grid and highlight), including FM music!