This is really cool! I like the fact that the tower is also able to defend itself alongside you, and that you have a default attack alongside your spells to help keep the pressure on enemies.
As someone with a lot of time in ARPGs, it felt a bit awkward to use right-click as my movement button. I think I also would've liked it if spells were cast the moment Q/W/E/R were pressed, rather than pressing and then clicking. All-in-all, this is fun!