Vector TD combines vector-styled graphics (remember the original Asteroids?) with the tried-and-true gameplay of David's other successful games to deliver one of the most polished TD games yet.
Choose between 4 "normal" difficulty maps and 4 "harder" maps. Press Load Map, and then begin laying out your strategy by purchasing one of the available towers. You begin with just $250, which won't get you very far initially. But, as with most games of this kind, you earn money with each creep that your towers dispense with; money that can be spent in real-time to purchase new or upgrade existing towers.
There are 4 main types of towers: Green, Red, Purple, and Blue. Each type works a bit differently on the oncoming vectoids, and each color even has strengths and weaknesses depending on the color of the vectoid. Most are laser based weapons that emit a damaging beam of light; however, the more advanced red towers send out rockets that seek their targets, and the blue towers emit rays that reduce the speed or stun the vectoids in their tracks. You can even change the attack mode of each tower, selecting between "close", "strong", and "weak". This setting instructs the tower on which nearby vectoid to target first. Learning how to make use of the different tower types most effectively is all part of the game.
Interest also plays a vital role in this game earning you dividends on any money you have remaining when a new wave begins. You even have the opportunity to increase the interest rate you earn via a simple bonus point system, earned when killing the bonus power cell vectoid in each "Hard Grey" wave. There are different options to choose from besides increasing interest, however, including additional lives, or increasing the strength or range of the towers the power-up is placed near.
Lots of options, pretty graphics, addictive gameplay. I only wish there were more sound to the game.