Really fun creative direction! I love all the little details with Scotch tape on the selector wheel, the cardboard edges, and even the cardboard texture on the loading screen. I personally wasn't a fan of the animation frames flipping effect, though—it was a little distracting for me as it looked like a mistake (like when an animation is missing frames), but I get what you were going for.
As far as gameplay, I thought the controls were a bit too loose. The character felt slippery and it was difficult to land jumps with much accuracy. I agree with some others that at times it felt like I had negative coyote time, falling off the platform before I expected to when trying to make a jump. The beginning, too, before you get a weapon is harsh. Too many small platforms where the enemy takes up nearly half the space was punishing while you're still getting used to the feel of the game's control. It was actually harder for me to get to the paperclip than it was to do anything else in the game and I nearly gave up at the beginning except for all the praises in the comments.
I did like the boss fight and the distinctive look of the different areas. The paperclip zip-lining is really satisfying, especially in long combos like the big vertical room. Going up the ziplines, though, wasn't clear, and I 100% agree with Starboi hooch that having the player have to use it to get out of the room/area with the clip would have been a huge help in teaching the skill.
Overall: could use a little love in control and balance but the mechanics are fun and the aesthetics are fantastic. Awesome job!
(PS - I'm jealous that you nailed the dust motes I'd wanted to do in our game xD)