A little known fact: John Romero gave Kemco the go ahead to make a GBC version of his well despised game. It's actually rather fun. Not the best game ever, but an enjoyable little diversion nonetheless.
I've started a TAS of this game.
Here's the first level, recorded using VBA 19.3. It's about 7:28, much of which, unfortunately, is cutscenes.
This game has an interesting little quirk: by pressing myself around a corner, my speed will build up for a few frames. I'll call it corner sliding.
The only real glitch I've been able to find is one that shortens the amount of falling time when you go off a cliff by jumping towards a wall. In order to keep the player from landing inside a wall, the game will place the player just above it, sometimes shortening the falling animation a great deal.
Comments are welcome.