It was a bit hard at first to understand how to play: a lot of options, a lot of possible actions to do with few guidance ^^'
But when I start to get how it works, it becomes very funny: I've planed to play for few minutes but I ended up playing more than 1 hour and reached the #1 rank! Human brain loves progress bar and increasing numbers, and your game is full of them: so it's very addictive :D