I'm not planning to run this game, but here's a trick to save time in one of the dumb levels: If you time your attack correctly, the moment of invincibility allows you to land on the spikes and walk the rest of the way.

ive had that happen in runs before its really hard to do though, because most of the time the game updates and kills you after the swing if you can figure out a way to get this consistently though, it could save a lot of time

I'm finding it works 15-20% of the time, which is probably worth the time saved in a game this short.

On a somewhat related note—what's the starting time for individual levels aside from level 1? The moment you hit the door in the previous level, or the moment it transitions to the level being run? I might be up for some IL runs, as long as you guys don't mind runs without a timer.

yeah what @MagicalTig said first frame to door entry

Ok, submitted a run for this level. Took me three tries to hit the trick without dying.