Originally Posted by Kirenx
It's fairly aggressive freemium. After you beat the first area you will have the first "deal" shoved in your face to buy the boss character for premium currency, and look at that it's a one time offer! Better open your wallet whether or not you've had the chance to decide if the game might be for you.
The difficulty curve increases exponentially, and the main premium currency purchases that will help you out are all temporary boosts. What is an extra kick in the rear though, is that if you attempt and lose a fight, you have to pay basic currency and wait on a timer simply to use those characters again. This can be especially annoying when you are trying to save up for an upgrade so as to be able to pass a particular stage.
I found this game felt like it should have been collectable, but instead it has a linear progression system of upgrading your main base to unlock new heroes. This means that aside from the "deals" you can purchase that will grant an extra hero here and there, you won't see too many different line-ups as players will generally be using the best heroes available for their level range.
I have to disagree actually. Having played up until current completion, I haven't had to buy any IAP to progress. As you clear levels your roster naturally grows, and the waiting doesn't become an issue. And it's quite generous too. I have a bunch of characters at level 30+ and the wait time for them is about 15 minutes. That's it.
Also you fail to mention that the game doesn't gate your gameplay with arbitrary stamina requirements. You also get the premium currency by playing the game, opening chests and completing daily quests.
Plus, there are events you can do for tokens that allow you to get characters that cannot be bought via IAP. Put in the time and you'll be pleasantly surprised
There's a lot of strategy involved in putting together a solid team, and once you find something that works for you like I did, things will really take off.
Now as for those deals, just ignore them. A bit of elbow grease and every character will still be yours