Fun little grindy game but the wall is a worthless. Why have it? it doesn't block anything after the first 5 waves. Suggestions :)
Wall:
-Give an actual health bar for it above it or just below it showing the amount of life it has
-Spend resources to increase its health\resistance to damage
-Add a reflect skill for it to reflect damage back from a percentage of what damage is done.
-Move wall between T1 and T2 Towers or between T2 and T3
Towers:
-Add options to target enemy's: first, closest, last, strongest.
-(Visual) Different Color towers? Brown is a bit blah :p
--Would be happy to exchange details to do it for you. I no dev but I can save you some time if you wanted.
Other:
-(Current/Previous Wave) have an option to set what ever wave you want after you completed it. so if you want to grind wave 50 once you hit 75 you don't have to hit previously or whatever.
I'll think of some more. Good time killer while I am at work during break.