Not bad… you really need to add in some more information about the game though.
Because I’ve played tower defence games before, I had a basic idea of what to do… but someone who has never played before wouldn’t know where to start. Maybe a few “how to play” frames would be good.
And also label every number you have on the screen. I didn’t know what each number relating to a tower meant. I could guess one was to do with money, but I’m not sure about the others.
I’d love to see what the finished product ends up like.