The original Atari Lynx version of Todd’s Adventures in Slime World, developed by Epyx and released by Atari in 1990.

It’s a decent enough game, although the Sega Megadrive version (which came later, in 1991) gives you more of the landscape to view at one time, so is arguably better.

Todd’s Adventures in Slime World is well worth tracking down if you want to play a decent Atari Lynx game.

More: Todd’s Adventures in Slime World on Wikipedia