Bah, you remind me of myself with my first game and how eager I was to see better comments. I'll give you only for this game, only this time 5/5 for encouragement.
"what kind of strategy is it, that let me place towers? " quoted from splejx. It seems that isn't only my problem. Because of your bad behavior, rating dropped to 1/5
Please go to http://html5test.com/ and see if your browser / operating system can handle HTML5. That would be my only explanation as to how you are unable to play this game.
There it's nothing that could keep me interested in this game. i see you tried to make a trap td, but with only 1 trap, you cannot do it. Make more traps, more monsters, not just a ball, an upgrade shop for the traps and some story. Work harder!
Overall rating: 2/5 (It is this high because it brings a new game concept. Otherwise it would've been 1/5 )
The game requires an HTML5 compatible browser, I do realize the graphics aren't that good but I don't understand you would give my game such a low rating because of the graphics.
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Why bother Playing?