Very well done game, though it has its problems like everything. I like the use of the limitation, though it was a tower defense game, I feel it was a bit more inspired than most. Its frustrating mostly in a good way, in that I wished I was better at the game.
It is a bit hard, and the enemies and defenders don't always react the way I would expect, for example, when putting a defender some would always target it, to the point that i put several shooters in a row and one enemy kept targeting the new one even if the older ones were closer. I have found that the bombers don't always explode and the blockers aren't that good at blocking, with the enemies deciding to target defenders further in. I assume the shooters are doing damage because the enemies are dying, but there's no indication it is happening, or rather, there's a little indication that it is taking damage, but not what is doing the damage. The basic is the most baffling, it damages by contact? Then wouldn't it need to make the enemies target it more? Is it a blocker with less health but dealing damage?
Visually, the game is stunning, you picked an aesthetic and stuck to it, and it shows. Everything being geometric is a good way to give a good look fast, and the glow effects give it more life. It is always important to get a consistent style and this achieved it.
Aspects of the gameplay could improve, and I feel it ramps up too quickly. Some tower defense games like to let you build slowly and others lean heavily in reaction to destruction like this one, hell, my favorite level in Kingdom Rush Frontiers does this. I just feel like there should be a faster way to build, as moving the mouse so much between the shop and the level isn't quick enough. Maybe with less, stronger defenders that could get better, as there would have to be less moving the mouse around, or a lean in hotkeys so that the mouse never leaves the stage.
Over all, I think this is the best game I've played so far this jam, faults and all.