Hey, I have a bad computer that can't run and record Refunct at all. However, at the end of the game it shows you the time you got with the map of refunct in a heart. Would it be okay or enough proof to just upload a screenshot?

This is to avoid cheated runs and stuff.

you can always record your screen with a phone if you have one as long as there is video proof of the run being done

Don't worry about recording your runs. Someday there will be a device to extract vivid memories from your brain. Just don't forget how the run went or we won't get to watch it.