The game is mildly fun for a few minutes, but there's virtually no content. It's the same thing repeated forever, and just drags on. I don't know what the mobile game market is like, but this isn't a passable game here.
There's a huge problem with this game. You can just teleport out of the way every time the heroes come by, thereby avoiding every shot. It makes the game too easy.
The controls are incredibly unresponsive. I could be playing, let go of a key, and it still moves, or I could be playing, press a key, and it doesn't move. It is really annoying...