Great roguelite concept, but the enemies become just so immensely strong by waves 6-7 that I just don't see how anyone could possibly keep up. A video tutorial of someone beating any level would be great. It would also be nice to see a fancier, serif font.
Other than these matters, I'd say the biggest remaining problem is that once you buy a tower into your bottom bar, you can't reread what it does before deploying it (my memory sucks!) So instead of clicking to read, I would suggest popup boxes to appear on mouse-over, to much more quickly access info as needed.
I think some ways to build a lasting community around this game would be to add a map editor, or even a seed-based random maze generator!
