The scope of this is crazy impressive for 4 hrs! This is a nice & polished game. The camera pan from the mimic family.. that's some production value :)
As another reviewer mentioned, i had some issues with controls getting stuck as well. But partially my fault cus my browser kept losing focus somehow, forcing me to refresh the page.
Not that you should have to work around that weird technical issue — but perhaps mouse buttons or a mobile-centric design philosophy would have been a good route for this genre since it would be so good as a phone game. One automatic benefit would be adding buttons for the Z and E keyboard shortcuts that I only knew about from reading the full instructions. A clickable button would have been intuitive at first glance without needing any guidance so no player would ever miss it.
Had a lot of fun with this, I love TD games. The music and graphics are excellent!