3 stars: Lots of ads, gameplay is fun but it's constantly interrupted. While you can skip them, you get reduced rewards so progression is slowed. It would be nice if there was a premium option with no ads for reward bonuses or revives. Controls are actually pretty good for a mobile game, but swiping doesn't always work.
4 stars: All in all its a fun game, but the fast red gems are way too fast and outrun your line, making it impossible for counterplay. That and your combos go off randomly without swiping. It has potential to be a 5 star game with some minor fixes!
3 stars: Such a polished app that could've been enjoyable by everyone, is brought down by the sake of greedy developers. The difficulty starts off hard, immediately, which I personally don't mind. Gold is of starting currency, but has no further use later on, in which you get an abundance of. Collecting green gems is ridiculously slow, and leveling up heroes cost upwards of $2 USD or more! From level 1 (default level) to level 2, for only the basic hero, it costs $3 worth of grinding for premium currency. I mean, I just started, too, and then it had to be brought to me like this. Watching ads are necessity, and it's difficult getting any progress, or items to further on, without it.
5 stars: This is honestly a pretty good game. I absolutely loved the first one and when I saw that there was a second I was so happy. I honestly have no problem with the game everything works good. The progression is perfect...