I love seeing other Godot games! I also enjoy a good tower defense game. Nice use of assets, and clever upscaling of the KayKit Skeleton Warrior model. Really good music too. The menu and recolor of the TV was an ingenious little menu.
The camera only showed top half the level which made the game, which made it very frustrating to play. There were also no sound effects, and hearing the pain of your enemies as you vanquish them is one of the satisfying parts of a tower defense! It also felt a bit unbalanced.
I'm also not sure why you didn't do a web export. It's really easy to do with Godot. It would probably get more people playing your game.
Overall a solid entry and would be a lot of fun with a camera fix.