Not the prettiest puppy on the block, but there is a good challenge to be had.

Aloha my dear friends and my mum,
I bought this game! Its really schwer/difficult and makes no fun.. One episode of spongebob circlepants has more contet then this game !!! I want my money back to buy some Jaegerwurst for my dog Klaus.

I hope you have a nice time on mars.

I plan on plugging away at this one a bit more, but for now I have to suggest you save your money, no matter how low the price.
The core game-play is interesting. You have to build energy towers, which can then power up the attacking towers. Everything can be leveled up a few times, and gains a special ability once maxed out.
You also get a small array of strategic attacks that recharge over time, bombs, and acid are the main ones I have so far.
It is also one of the TD games where the enemy can shoot at you, and therein seems to lie the main issue, and by level four it seem impossible to win, as your towers are all out of commission much of the time.
The masses of enemies doesn't help, either.
The game is lacking in other ways as well. For example your success is rated in coins or medals based on how well you do, but there is nothing to spend them on. Why have an apparent currency if you can't do anything with it? Hard to assume anything but that the game designers simply never completed that piece of the puzzle.
The graphics and animation are primitive, but get the job done, but the controls are wonky at times, especially when scrolling, as the maps are larger than the screen. Not a bad thing when you can look around smoothly, I couldn't.
Given the issues with game balance, the unpolished look and feel, and sense of being unfinished, I can only warn people away from this offering. Stay away.