Well
Aside from being horribly generic, there were many flaws which ruined the game for me.
-All towers besides double "Mashine" gun towers were utterly pointless
-There were only 3 types of towers, 6 including the powered up versions
-The AI of the towers was HORRIBLE, I found them constantly shooting at enemies with full health that just entered their range as opposed to killing the enemy with ONE health that was about to make it past them
-The enemies were terribly boring, with no differences between waves aside from more health
All in all, I think that there is quite possibly a lot of potential here and I look forward to seeing more from you.