Hi Sergio,
Your build it awesome and I love the VFD style for the Wreck-It Ralph and Fix-It Felix Jr.
Do you plan on releasing the source code to your games? It would be great to enable other people to play it and even learn from your work.
With regards to your earlier comment about MAME on Raspberry Pi playing Coleco hand-held games. You can in fact load up the most recent versions of MAME on a Raspberry Pi 3 and play the old Coleco games. It works rather well on the Raspberry Pi 3. Not so much on a Zero though. If you use RetroPie, you can install lr-mame which is the latest version of MAME with Libretro. I've also submitted an installation script to the RetroPie team for the latest MAME. The only drawback is that MAME must get compiled, which takes about 1 full day. The script handles all of the work though, so it's actually quite easy, just takes long. Anyway, I know your builds are done, so really just for future reference.
Would love to be able to play your games and take a peek at the code too. Thanks!
- George