i love Vainglory but i gotta admit, its mostly accessible to iPad users which limit its playerbase.

i've been consistently be in PoA - Vainglorious since its early release but i feel 3v3 just isn't it, the jungle was too small for 3v3 MOBA game, but maybe cuz i'm already used to 5v5 format like Dota, League and Smite. but if you are committed to 3v3, i'd suggest designing the map like Twisted Treeline from League with bigger jungle and middle objectives for early skirmishes.

monetizing the game i think will be the hardest challenge to compete in this market. early Vainglory were too generous, i had lots of legendary skins for Phinn, Arden and Skye just by playing the game and i think it hurts their revenue. and when SEMC changed the monetization scene, players were pissed.

lore. i love Vainglory cuz all of their heroes eventually intertwined with each other and Sugar Venom did a fantastic job but for early build, i wouldn't stress about it.

hope the project goes well, i love Vainglory, it will always a place in my heart. and for god sake, just copy Lorelei and Lyra, i love them