I like the implementation of the tower defense it works very well. Unfortunately I couldn't upgrade, move or remove towers at all. I tried the web and download version but had this issue in both.
https://gyazo.com/7fc15ab6f6594dc25ea0df64e4990309
I saw the VOD from @Codoor his steam and saw that it worked on his end so its strange but overall looks like a nice game.