Hey Yarrichar, really love the concept.
Playing it i felt I needed to see the How to before getting in to the game and having it as an option to view it again while in game. With that in mind I think, it would be a cool thing to stop the clock if viewing the how to instructions. I say this because it punishes you and ends the level before you can read it the first time around.
I would also like to be able to earn Gold easily somehow to place down more towers at the start, maybe rewarding me by destroying empty wall blocks or something like that :)
Overall, I loved the overall feel of the game, very moody and clearly has a purpose, simply gameplay making it easy to pick up. Just that hard to know what to do curse with instructions on the game play screen and being against a timer there :)
Thanks for letting me play and I hope your having fun dude!