@WeatherPi
Maybe you could host your scripts on GitHub and hopefully the community would contributes and help you add new features.

Might be better to have short games that take a couple hours to finish unlocked for a day but maybe longer RPG style games should be unlocked for several days? I'm not sure if your friend likes to focus on RPG's to finish them or if he plays RPG's at all. Maybe RPG's only unlocked over the weekend and have a small handful of unique shorter games unlock each weekday (like different ones every weekday)?

Very nice!

I know this post is, like, two years old, and I hope I can get an answer but what did you use to design this?

@danielmewhouse Thank you. But no, I'm not planning this. On the other hand: It's all OpenSource. Nothing hidden nor encrypted inside my installer. Take it as a template for your own ideas and feel free to realise whatever you want.

This is very nice. Love it.

Hello, I love this theme, currently I am missing only Wii and PS2 images. Do you plan to add them in near future? Without it my system is incomplete and I have to use duplicate pictures from PS1 and GC. Thank you, you're the best!

How about a VISUAL NOVEL category? :D

Well take a look at my latest build. You just have to connect one Bluetooth stick and can buy two controllers. The build provides good portability and does not cost so much.

Anyway your design idea looks great but for what do you need annother OS? RetroPie is based an Raspian and you can install a GUI :)