This is an asset pack intended to be used as a jumping off point for retro platformers emulating the Game Boy aesthetic. 

I've made a sample project on this itch page:

https://fava-beans.itch.io/catilas-mini-gameboy-assets

Keep in mind, it's only a demonstration, not meant to be a polished game.

The pack includes: 1 player character, 5 enemies, 5 terrain tilesets, 5 visual effects, 9 game objects, 17 sound effects, 38 GUI elements, and 60 Misc single tiles

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This pack is a remake and I believe an improvement of a similar pack I made a little while ago, which you can find here: 

https://opengameart.org/content/gb-platformer-starter-pack

The older pack is much more basic, but perhaps still useful. The pack on this page is more complete and its sprites were drawn at a scale more appropriate for a Game Boy's resolution: 160 X 144