I really enjoyed this!
Very well thought out and executed puzzles, no major bugs, excellent animation on the doors and crawlers. Just very polished overall.
I thought the idea that it's optional to let the player progress without bringing all the robots to end was a great subtle way to let the player choose their own difficulty.
The only problem I found was a missing collider on the tilemap (I think it was level 5) which let me fall through the world. Not a major issue since you can just reset.
Other than that, amazing work, can't believe you made this in a month!