If you have spare money on your hands you might consider having a look at this rather freshly released action platformer SNES game called Dorke and Ymp. If you don't own a SNES you can Greenlight the game on Steam and hope for a virtual release. Read more about Dorke and Ymp (Commercial) (SNES Game)
Real Game Boy games are a challenge to code, not only you have to deal with restriction such as low CPU power, also the limited color scale (if you can talk about colors at these grey scales at all) is distracting new coders to get familiar with this system. Read more about The Bouncing Ball (17-08-2015) (GB Game)
Aseprite is an open source program to create animated sprites. Sprites are little images that can be used in your website or in a video game. You can draw characters with movement, intros, textures, patterns, backgrounds, logos, color palettes, isometric levels, etc. Read more about Aseprite v1.1.1.0 (Pandora Application Port)