Gotta say, this is an excellent puzzle game, and one of my favorite games in the jam so far. Love the concept, love the art. Please keep working on this because it's definitely something I can see myself paying for in the future!
As for criticism: While I was able to figure out what all the towers did with some experimentation, their exact function could use a bit more explanation. I'd also like some quality of life changes, like being able to see the towers' power costs and target power to activate the teleporter.
I also didn't realize until about halfway through that you can delete towers by pressing Q while holding them, you may want to include that in the instructions, as it's not obvious (I figured it out by accident).
Finally, running back and forth to grab multiple towers while experimenting got pretty tedious. Not entirely sure how to fix it without interfering with the gate mechanic, but it's something to think about.