Oooh, I love the mood you set!
As someone who plays/makes too many platformers, let me begin with my biggest complaint. The timing on the double jump. Forcing the second jump to be before the apex of your jump just feels awful. I believe the timing is this way due to the hovering mechanic in the first 2 levels, but I was genuinely struggling at time to make the character double jump the way I wanted them too, even long after the hovering mechanic was removed. Honestly, that might be my only complaint.
These aren't complaints, but a series of neutral thoughts. I thought it was strange that all objects except screws required you to press a button while standing on them to pick them up. The wind sound effect had a very noticeable looping point. I found it funny that the conveyors never broke down in this place. Everything may be falling apart, but those conveyors are holding on strong.
The background changing over time is fantastic, and I love the character decaying as well. The art is delightful.
I love how you open the game with a suite of movement tech, and narratively take them away. It's a great use of the theme, and it sets up the story so well. Poor little robot, still trying their best despite the circumstances.
I like how you use the player's name in a lot of the storytelling segments.
All around, this was a great game! Nice work.