I had a bit of trouble understanding what to connect, but after I figured out that the white circles were connection points, I was able to generally figure out what to do. I stumbled a bit when making some connections between the two buildings that somehow prevented more movement - but after deleting and redrawing them it seemed to generally do what I wanted. I was confused that even though the towers seem evenly spaced, some of them still don't overlap the gates as well as others, and I never really figured out what the gears did. The art looks great, and it was fun to make a little factory of carriages moving to different destinations. Here's a playtest

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 :)

I found it very difficult to understand, in the tutorial stage I was pressing all the buttons on my keyboard before realising that I had to use the mouse, and I found that the strategy of the gameplay wasn't clear at all. I also found the lack of sfx left the gameplay feeling quite flat. I liked the visuals and the painterly style of the grass though.

I think the start is good, where you make the player draw a path, so the player knows the main mechanic. However, the second level throws too much things at you at the same time. Took a while before I understood where the carriages were spawning. You have upgrades (I think? blue?), range (and damage? green) and you can also directly draw paths from spawn to the towers (is worse than getting the bow/green first?).  Giving everything green arrows seems as the optimal strategy, but got overwhelmed fairly quickly. Some enemies stay out of range. My advice would be to introduce each element one at the time, and make the player notice what changes each time.

had some trouble understanding how it works, i think you draw paths from the castle to the towers to supply them

but im not sure what the ranger house and the repair house was for, and how it worked

Concept is very cool, but the execution needs a lot of redesigning, i didnt understand what the blue bar is for, i would limit the amount of roads on screen and make it more obvious how much carriages tower needs to sustain itself   

I did not realize that roads were directional for a while, so I just drew roads from top to bottom -like the example- and nothing happened and I didn't realize what the problem was. Gave the game some extra time to figure out what it was expecting, but even so, monsters love to clump near the middle of the top gate, where it takes until archer upgrade #2 to target them. Even focussing on just the bottom two towers and one of the top, focussing on the top after the bottom reach the 1st range upgrade, I was killed before I could then get enough of the other upgrade to kill the monsters faster than they were killing me. 

There might be more to this idea, but having unwinnable scenarios pop up so commonly and so soon prevents me from exploring it. 

I couldn't really figure out how to play this one unfortunately, I liked the look of it and the concept of like a logistics based seems interesting though.

Took me a while to figure out the mechanics. Once I figured it out, I found the game basically impossible to survive. Interesting idea, but definitely imbalanced.

Ok, to be honest this is a interesting concept that has been executed poorly. But i like the idea, just not there yet.

after several minutes of confusion i realized the goal was to draw roads. for the first couple games i drew all the roads and died pretty quickly; i thought "there is no interesting decision" then I realized you could remove roads! suddenly the game shifted from poorly tutorialized to poorly tuned:
- the right side is twice as far from the arrows so it takes twice as long to arm
- the towers do not start covering any of the gate and it takes several minutes to make the range large enough to include the gate; so once you start taking damage it's over.
- there are too many monsters. it needs to start slower and increase linearly
- other tower defense games give you a lot longer to start damaging enemies and usually allow you to start damaging them very far away from the tower.  I would make all the towers have max range and make the one hut only increase the rate of fire and the other increase damage.

I didn't find the main mechanic explained very well and onboarding could be a little smoother, the game felt it had a little designer-itis.

Would be nice if the towers prioritized the closest enemies first, I noticed they kept targeting far enemies while the gates were getting hit that could also be contributing to the difficulty in a way that players feel is unfair.

With some sound and more communication it'll be a very satisfying game.