Oof, those are harsh words. We've heard some reports about performance and how running a different exe file in the package improves performance substantially. If you wanted to give it another shot, some people mentioned that running SysAI\Windows\GMTK2025\Binaries\Win64\GMTK2025-Win64-Shipping.exe resulted in the game lagging a lot less.
Unfortunately I think we weren't able to finish the setting menu in time, so changing the graphics preset doesn't work at the moment.