You've got a lovely puzzle platformer here! I could have gone for some more checkpoints within each screen, but that may say more about my ability as a player.
I wish the sliders had been more harmonious with the aesthetic of the rest of the game -- I think you can achieve a happy medium where they are still obviously "outside" of the environment, but still share some aspects of the visual language. Maybe just make them bolder and brighter. If you put a marker/handle icon on them too, that might make their use a bit more intuitive for player.
Still, I think you could build this out into a cool Metroid-inspired game where you ceremoniously unlock different dev tools (as it stands, the way you unlock them feels random. Throw in more pomp and circumstance!)
I'd love to play an expanded version of this. Keep up the good work!