Post all glitches you know here:

Holding two directions gives more speed similar to movement in DOOM and morrowind

Sometimes on stage 3 I will glitch through the walls if im going high speeds, this is in the corner when you land on the left side. Maybe wall clips are possible in other places too.

Any corner can be climbed up the wall by using two direcitonal keys into the wall, this is very slow though and haven't found any use.