The use of the limitation is kind of a stretch, but I'll let it slide (no pun intended).
The gameplay felt very smooth. I liked how I could speed up and take the corners at full speed without slowing down. And if I had enough resources, I could hold right click to keep building and going through the new path, so satisfying. Then I tried using an autoclicker for shooting, and as there is no cooldown, I could shoot like 30 bullets per second, which was awesome.
On the down side, I think the bullet spread was too much. I had to get pretty close to the slimes to hit them. It would not be a problem if I was able to improve the accuracy later in the game.
This is more personal, but I don't like stretched pixel art. It's a shame because the sprites look good and consistent, but the stretched sprites for the core and some UI elements make it look a bit unpolished to me.
Also, the game froze when I tried to connect the core to the other bases, so I had to play avoiding that.
Overall, I liked it a lot. I wish I could expand the base more and maybe have some new buildings unlocked.