Its a very good game polish wise, the main complaints come from the matchmaking, if youre high level you play with low levels making the special balls you get more or less useless because you can only use the balls unlocked at the lowest level, and if youre a low level its near impossible to beat high level players due to them having upgrades that you dont have, leveling up is also pay to win, you get no XP for winning but instead from opening packs (quicker with gems) and upgrading using cash.