Your graphics are abysmally horrid. Controls are unresponsive. The graphics don't actually correlate to any hard objects. No sound, at all. The whole thing is ugly, and your advertising is rude and tasteless. You should owe me time and money for having played this at all.
This game needs: A hotkey set to automatically upgrade the selected tower.
Hotkeys for each tower type.
A 5X game speed function. If all we are going to do is build and upgrade basic towers, we really need to be able to kill enemies faster.
A button to upgrade all towers to a certain level, at once. Just for convenience.
Some sort of normalization on the bosses. I slaughter everything else but the bosses don't get dented and crash into my base. So not cool.
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I made this when I was 10... First game.... Plus I had to draw all the stuff on my computer (NOT AN ARTIST!)