First scene I finished by accident, I thought. 2nd - it was not so easy with lines from the mouse and different lines from the building site. And then the slime comes :D paniced a bit but when focused more on lines and possibilities I connected the... dots! (badum-tss)
To make this feel more intuitive, the Gear should add more range, and the monster could be more random in moving to the gate, maybe with a bigger number. Cool concept, could be a very intuitive, easy-to-start strategy game. Then add the juice ^^. Find some free sounds, samples, or tracks online and try with one to add the tempo/atmosphere here or there. Keep it up :)