1. I have completed Episode 5 in the under par on hard difficulty challenge. You can view it here.
2. I've done a super-speed playthrough, sort of a fastest route walkthrough video, of the first three episodes on the easy skill (Don't Hurt Me). No secret levels or secret shortcuts, otherwise the goal is just blast each level down as fast as I can. In fact I finished all 24 times levels (each Floor 1 thru 8) in under a minute per level, and my full episode times come in just shy of five minutes! You can view this video here.
As always I hope you enjoy the videos and all commentary is highly welcome! :)