Conceptually its good, execution, especially the controls could use polish and improvement. The whole building system is unnecessarily clunky, why need to right click and left click just to place buildings?
Just left click to select what to build, click and hold to choose direction and release the left mouse button to confirm, or right click to cancel. Its a time tested, intuitive and proven control scheme done by countless RTS/defense games.
Also, middle click to rotate the camera.
Other quality of life things, like tooltips and a direction of where a wave is coming from are necessary, especially when there is not set path or direction for enemies to come from.
Overall I can appreciate the vision, just needs to iron out some things to make it fun to play,