Very cool that you added an intro video. I got kinda far in it. Gave up after falling though the glass after the stone wall with misleading doors part. I just didn't like constantly having to recollect the biscuits and reclimb the beginning area. Unless this is meant to be a rage game, I would of added checkpoints and have you keep your collect biscuits or lost some on death.
Also I find it funny making the enemy guys attack each other. lol
Great job. I love 3D platformers.