Loved it! Very fun gameplay and very well explained step by step before putting the player in the harder execution. I'd advise not to put the reload (R) button right next to the connect (E) button, because I've definitely restarted an almost complete level by hitting the wrong one by accident. Maybe use Q instead of E, or even the Enter key.
Adored the style of the graphics, it all helped with clarity of image a lot and each element stood out nicely against the background without creating clutter or confusion.
The slow build in difficulty was smooth and didn't feel punishing, which I always like in these puzzle games. Every step felt earned and rewarded.
This might be more of a personal take, but I would make the obstacle robot a different color. Just to make them even more obviously deadly. They turn red when paused, but maybe invert that and make their base metal red, so they can turn grey when they are paused? Obviously this is a nitpicky detail because I'm trying to find things to critique in a very well made game!
Very fun to play, I'll likely continue playing it in my free time.