Pretty cool idea, and great execution on the graphics/sound side! Wish there was some variation to the gameplay, it kinda gets repetitive after 10 or so waves, and you eventually start getting time faster than losing it.
I think something's wrong with the web build (Firefox browser). I can't click anywhere in the game after I click on the "Play" button, and the button itself is misaligned and is placed over text. Win build works, but it too sometimes doesn't register mouse clicks on pylons.