A cool homebrew top-down puzzle/platformer. Play as an Opa-Opa wannabe and wander around little labyrinth planets, picking up keys and avoiding water streams. The graphics look very distinctive, as the planets are spherical, and drawn with a trippy pseudo-3D effect.
Similar to Battle Kid and the Fortress of Peril, it's a new game released on cartridges to be played on the actual hardware. It's a gorgeous looking game, and can also use the Sega CD add on to enhance the music. Made by homebrewers for profit. Unfortunately, being made by homebrewers for profit, it's specifically designed to not run on just about every single emulator, plus it's hella hard to find an actual copy (seriously, go look up the price), and finding a working ROM is really hard too since the ENTIRE INTERNET went full moralfag on this. The enhanced OST is available for free to burn, here. There was a successful kickstarter to rerelease it in HD and on several newer platforms, such as the Dreamcast. Check it out.