Video games make a lot of assumptions about aliens, mainly that they're going to be two-dimensional and prone to shooting at stuff. It's an unfair stereotype, if you ask me, but also makes for a better game. That's very much the case in Super Crossfire which packs a ton of alien-blasting action. Yay for stereotypes.
This game includes 150 waves of glowing alien craft with another 150 that can be unlocked later. Super Crossfire looks a little like a bullet hell shooter with all the projectiles, but it actually forces you to hop between the top and bottom of the screen to avoid getting blasted. It's a neat twist.
Super Crossfire looks a little simple in the screenshots, but seeing it in action in the video gives you a better feel for it. The way it changes perspective when you flip between the top and bottom of the screen is a particularly cool effect. Fans of top-down shooters should take note. It's $1.99 in Google Play.