I couldn't find any C SDK sample for thumby color so I made one. This is a port of PICO-8 game "Hyperspace", a 3D space shooter game.

https://github.com/itsmeterada/hyperspace_thumbycolor

Wow, this looks awesome.
Is the colored Doom source code available somewhere?

Oh, it was on your github already :-)
https://github.com/AncientJames/rp2040-doom

Mine had 12 games preloaded.

My TinyScreen+ Rev.3 suddenly stop working when I was debugging my code.
It doesn't appear in the COM ports anymore and there is nothing on the screen.
Resetting the device didn't help.
(BTW, to reset the device my one require to push the top button instead of the
closest to the power switch. Is this normal ?)

Any advices ?

Thanks,