We've been making more and more improvements to the game!  The upgrade system is largely in place and you can get some nice upgrades already.   Game play is much more well-balanced.  Help image added to address the misunderstanding on how to aim and shoot.  More and different enemies.  Persistent progression with badges/medals you can earn as you get better and better and nuking those aliens!

Check out the latest BETA version of the game and give us feedback.