Thanks for you feedback! I whipped up the menu screen in the last few minutes, so I wasn't able to put much effort into it. I will be completely redoing the menu in the future. Deselecting towers by default I think will help make the game feel smoother and I might add some hotkeys to make the gameplay feel quicker and easier.
Sound effects and music is my weak point. I was able to get some good free sound effects of Zapsplat.com but I have a hard time finding free, royalty free music. I will try to add some at some point. If you know of any sites I can look at for free music feel free to let me know!
Thanks!