IronCat

IronCat is a combination between a shooter and a tower defense game, where you play a warrior cat who has to fend off the attack of alien invaders. Luckily for you, the cat is heavily armed with machine guns, sniper rifles, bombs, etc.

In the beginning, you have to fight the bad guys as a normal cat, but as you advance in the game you can unlock two new cats: the Iron-Man cat and the Captain America cat. Of course, you can also unlock tons of new weapons, too.

In IronCat you can travel to seven different planets, each with more than a dozen different levels. That said, you have to rescue each planet from the invaders before you can move on to the next one, which isn't exactly easy. However, with the help of all your special weapons, you might stand a chance.

IronCat is a shooter with some tower defense elements, nice graphics, and lots of different levels for you to spend hours killing aliens.