Thank you so much! Indeed, I had no time to put the tutorial level I had planned originally, and the green, white and brown/red bricks are the drugs you have to confiscate, I also had no time to make that clear.
A lot of stuff was left out like being able to sell the drugs you confiscate and unlockables because of the time constraint. But I plan on updating this game until it reaches my original vision for it.
And thanks again for the comment, it's very kind!