Variables: the top left is the price of the monkey, the top right is your HP, the bottom is your points. Mouse: the mouse is used to click on the monkey and place it click once don't drag, if you click on a placed monkey then it will show its rage and an upgrade if there is one. switching towers: don't click on the tower to switch it that will buy one instead click next to it to switch
if you are on a pc or anything that has a keyboard switch to the original project it was more stuff in it due to me making this one on mobile I had to remove 3 towers and 2 maps to get the game working right