i agree with previous reviews. also for the upgrades, i clicked one time just to see what "field gun" even meant and accidentally purchased the upgrade. you dont explain anything and there really isnt any strategy implicit when we dont know what we are buying but still potentially waste money just by trying to find out.
once ive purchased an upgrade, clicking on it again purchases the next level of that upgrade. the field gun on its 2nd upgrade seems to be worse than the basic gatling gun in every way, and takes longer to build. this game just doesnt really make very much sense
on level 3, the enemies just walk straight up to the base and dont even follow any reasonable path to get there. how am i supposed to place towers when the enemies appear right next to my base regardless? i literally put a tower in every space and every single enemy still made it past without taking a hit.
did you play test this ?