Take this review with a grain of salt. It's a somewhat long read, but I'm giving it a fair chance.
The main thing above all that you have to remember is that this game was made for PHONES
which is why there is no chat or creeps or whatever else you wanna pull out of other more platform appropriate games such as DOTA 2 or League of Legends.
After reading the majority of negative reviews, seemingly written by kids who were blessed with top tier gaming computers by their parents, just angrily comparing it to other games; I decided to go against their "best judgement" and give the game a shot.
After playing this game for a few hours, I found I liked it and that it did what it set out to do; Which is quick PVP. It is what it is and it's not trying to be a lot of different things.
The characters can be beyond over powered, more than likely because the people using them have leveled them up to max and have picked all the right skill upgrades or really underpowered which is mostly all low level characters, but that changes quickly as you level frequently.
The game is no where near pay to win since you can get the in-game currency "Valor", pretty quickly and the battle buff potions can be bought before each game for 100 Valor or you could just take the free one, their effect isn't too noticeable
The only problem I really have with this game is the inability to communicate after games have finished. You can add friends/refer friends but there is no way to chat in lobby or private message or add each other on Steam.
The longest game I've played was 12 Minutes long and the shortest was 5 Minutes. It takes about 40 seconds on average to find a game also, so I'd say if you want a pretty quick PVP game but don't have 30+ Minutes for a game of DOTA or League then this is a decent short term substitute but it's nothing to quit another game for.
For what it is, I've had fun with it and I think if you want a quick game and you go into it with an optimistic attitude then you will too. The lack of communication in game isn't that big a deal as most people respond well to the pings and games can turn around pretty quickly based on player skill.
I give it a 7/10 for what it is.