4 stars: Long time player. 16 top tier rank 6 heroes, 1 rank 7 (almost 2) and 100+ meteors. Overall enjoyable. Some maps are near impossible with even the best heroes. Gets frustrating at times. Dont mind the time to put in for leveling up since it means you don't have to pay for the immediate wins, but effort does not seem to reflect well on the hero leveling vs. Enemy difficulty at times.
4 stars: Honestly, I just enjoy it, I know some people don't, but I find it enjoyable. Not a fan of the microtransactions, but it's a Mobile game, even PVZ has microtransactions.
3 stars: Great game, lots of hard level as progressing along the way. Hope that some old heros get revamped and new heros to come along as well! (Enjoy for those who love defense games like this one).
5 stars: I've managed to play this for years without spending more than $10 and the ads are unintrusive. Fabulous, shows how free games can be made well.
5 stars: good tower defense game, many different towers and many diffteren mobs, heroes, and bosses for each map. Gives a lot of premium currency, just like all other games have patient and let the wealth build up
4 stars: It is a nice game to kill time, they do kind of make you want to buy the gems in order to progress, but it is possible to do it with a long grind if you are not in a rush for achievements.
3 stars: Fun initially but at World 3 it becomes a pay to play. There is no grinding this game nor paying only a moderate amount. To pro...