[@FallenTrinity]
Yup we always got room ^.^ as for the questions
Yup, same universe yet an alternate dimension (to avoid conflict with the webtoon/anime)
As for time, imagine it taking place around the beginning of the anime or basically before the attack of Boros. Meaning the Hero Association is widely known but isn't as influential as they get after Boros attacks. 
Advancements of technology is the same as the manga, meaning you're free to make a giant mecha character or something similar to Genos.
For OP, well if you have to ask if it's OP it's likely OP xD nah I kid but basically nothing over the top like Saitama's. If I see it has potential to become greatly OP, then I won't allow it but I'm trying to be lenient when it comes to powers.

Hopefully that answered your questions ^^