Thanks for the report. I clicked through all the game modes on Windows but wasn't able to replicate. (the ruby ridge levels are definitely buggy, but don't crash for me.... I should probably remove them for the time being).
Could you possibly send the crashlog to email@example.com? It's in Crescent Loom/internal/logs/
Re: small UI, thanks for flagging that. I'll add a to-do to increase the default font size and contrast.