I'm making a gameboy-styled first person shooter in GMS2. So far so good, it was hard for me to figure out the rendering after making so many things with the D3D functions but I think I am finally comfortable with it.
It's a spiritual successor to JW's Boom game which I now realise is over 7 years old. I liked it a lot at the time, and wanted something fun and simple to distract from my main project.
It's more or less a Doom clone.
I'll post cool gifs on my twitter, as always. I'll also post a playable once I add a level and also figure out what is crashing the game on exit (most likely the matrix or format definition functions, please let me know if you have any ideas of what it might be).