I visited my little brother a few years back while he was interning. Since the place was out of the way of most things, I spent a couple days writing this toy RPG engine.
To run it, you just need Ruby + Gosu.
Go to the main directory and run: ruby -I. main.rb
Since it was hacked together, I can't guarentee it'll be easy to get working, so here are a couple screenshots from it actually running.
Note! The graphics and audio are NOT mine. I just threw in some things I had laying around from the RPG Maker 95 era to test the engine.
Also, shoutouts to Thorbjørn Lindeijer and everyone involved in Tiled!