Excellent game - I really think the only thing that will stop this getting into the top 20 (if it doesn't) is the lack of tutorial, which is harsh given its a game jam.
I have 2 tiny bits of feedback:
First - I felt like I could cheese the level with 3 flags at the bottom, 1 at the top. Personally, that didn't feel right as a player - I wanted to know I'd chosen the right solution, not cheesed it.
My second bit of feedback is about the scaling tool. It didn't quite feel right scaling from the center. Intuitively I thought it would only extend from the side that you're moving the mouse towards.
It would be more difficult to scale down in this way - maybe it would need 2 more clickable entities. Anyway you guys are clearly great game designers so I'm sure you could figure it out if you think it's enough of a problem.
Great job, it's really polished and a one of the best "complete" games I've played this jam <3