Need help for tower defense game windows!

Hi so i am entering a contest with my team and i made some art for this. I have a canon that shoots projectiles but i need to be able to click on the canon to open up a menu to be able to sell and upgrade how would i do so? Also how would i make a range where the canon can shoot when a enemy enters the range? And i need to make it so when you kill a enemy it gives you a certain amount of money? And i need to be able to have a pop up menu to buy new towers and also to make the enemies follow a path too? Please help me please!


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