Once again, I've been helping develop HeroKGs server, and once again I say its tons of fun. Each kit feels unique and powerful.
Adding to this, his balancing technique is that if a character is too powerful, buff other characters to match. Theres not much behind a paywall, and the map is immersive with room for expansion.
All in all I say its great and you should definitely give it a try if you like feeling powerful without being OP.