This is just really well designed. Plenty of innovative concepts mixed with ease of playability. A variety of effective strategies but still a significant difficulty level. A variety of maps.
5/5 definitely. Best TD I've played in a long while.
I had fun for a little while, but severe balance issues with the rocket tower made every level very simple as soon as it was available. Most of the time I didn't even have to move the bunny, if I wanted to I could have set up the rocket towers and just let the game run solo.
It's a good game in a lot of ways, with polished music and gameplay and easy controls, but unfortunately the difficulty level is nonexistent (tried it first using only thrown weapons and thought "wow this game is too easy" and then tried it again with guns and found it to be even easier, getting a perfect on almost every level), and the lag to be unforgivable if a lot of guys are on the screen at once (just use guns though and the lag isn't a problem, as the bad guys will never have a chance to amass ;).
For those reasons, I can't give the game more than 3/5.
I gave this game a 2/5. There are a lot of flaws. The enemy types for the most part don't matter, if you click on a tower at the bottom of the screen you can't see it because the upgrade screen covers it, you can't see what different towers do without opening up a separate window, the extra one-shot abilities are almost entirely unnecessary, the game is incredibly easy (I played a total of five times), you spend most of your time just watching the game waiting for the next upgrade instead of doing anything, and the tracks are uninspired to say the least.
Tower defense is by far my favorite genre of flash game, but this one, I won't be revisiting.
All that said I do think it's a noble first attempt. There aren't any fatal flaws that make the game unplayable, so if the mistakes are cleaned up in future games, it could be promising.