as someone who is making a tower defense game where the character can move around lay towers. I was really into this design. Using the one tower makes things frantic. And the upgrade system was cool. The currency system was interesting b/c normally you get currency for killing enemies but here you had to move away from your tower which was a risk reward b/c then it could take you longer to move the tower if you needed and I think that was the magic of the design right there. Without that aspect it wouldn't felt as good