ill make a quick summary
pros : game size is small , controls is very smooth , aim is easy since its auto ( so back to basic just hit and run ) , skills + weapon is customizable , graphic is clean enough .. so for a game that under 100 mb this is very shockingly well made . simple & fun game !
cons : not free from ads (at least its not pop out of no where) , no coop system (cmiiw im afraid i need to reach certain rank to unlock it .. but i highly doubt that) , no chat system , no guild system , no story . again just simple game yet still good !