This game reminds me of starcraft + Command and Conquer and traditional tower defence games. While I do think the concept for this is pretty good, I did have issues with some of the mechanics in the game. The main one being the randomness of the sandstorms. They would hit whenever they wanted to which greatly impacted the gameplay of this game. There would be no power which meant you couldn't defend you base properly and you would end up loosing all because of the random sandstorms. I think these need balancing so that they are not suxh a hinderence to the game or taken out completely. If it was more of a real time strategy game then maybe sandstorms wouldn't be much of a problem in the game because you could constantly be gettimg more resouces to upgrade your base to combat the sandstorms effect but this isn't the case.
Also, there needs to be a tutorial. While I myself hate tutorials, you should at least give the player the option to play one. Especially because of the management aspect to this game. While I disagree with a tutorial being a mandatory part of the game, it should still be an option for the player.
Lastly, there is no 1080p option in the menu so we have to play it at 720p.
Apart from those things, the game plays pretty solid and how you would expect it to. There is still work to be done here before its really ready to be released fully but you are on the right tracks to creating an awesome real time tower defence management game.
Heres a video for you to enjoy.