What does that even mean? Ive seen Duplex run Bug Limit on twitch, but idk what it means..

(sry if this is a stupid question, I'm new here)

(Duplex Link)

Go to misc. and to bug limit categories, it explains it in the rules

Bug limit essentially means to finish the run using only developer intended strats. No glitches are allowed, meaning the use of windbombs, bullet time bounces and other unintended mechanics in the game will result in the run being invalidated.