There's an alternative way to beat level 17. (I didn't figure out the real way until 2nd playthrough) as you fill in the tri-light quickly run for the shaft so you can fall ahead of the block. If you time this perfectly, you'll have 0.5 second to move right and away from the block. You might want to fix it, or leave it in- Valve would.
It seems if you are not fat enogh you can get stuck in the pre-level door (the left door) with no way to respawn (the healing block heals you when you try to die)
While the visual style invokes Company of Myself, the game-play isn't actually all that similar (aside from the first part of this being the same as the middle of CoM, they're quite different).
What is up with the shooting gallery? It moves several times every second even at combo 1. Noone could hit that 10 times, hell few would manage 2 in a row.
Alphabetical...