When I tried to boot up Celeste today, it would load for a while and eventually crash, and the errorLog would open twice with two different errors. It was working the last time I played it so I'm not sure what exactly could have caused it to break other than an auto-update or something.
#Celeste Crashing On Startup
high burrow
strong flame
this is either a non-png image crashing you or just an oom
hot tangleBOT
Having too many large mods installed (especially collabs and mods with high resolution images) can cause out of memory errors, which can appear as crashes or texture corruptions.
This can be fixed by disabling any mods you aren't using, which you can do by toggling them in the Olympus mod menu, adding their filenames to the blacklist.txt file in the Mods folder, or if your game can launch, by turning them off in Mod Options.
If this doesn't fix the issue, either you haven't disabled enough mods, or (less likely), it's another type of error.
high burrow
lemme try disabling some mods and see if that fixes it