https://github.com/Monstayoung/RP2350_Thumby_Color_DOOM
Try it here. Let me know if it works.

Hey guys sorry if I'm breaking any rules posting here but I recently got my friend a thumby as a gag gift and I wanted to give him one with this port instead of the "Thoom" game included in the arcade page.

I don't have any experience editing things but I had the same problem with making it to the splash screen but it freezes there. How do I edit the SPI clock to get it working? As in what to download/install/use? I just need a nudge in the right direction.