It's a JRPG MMO in the style of Final Fantasy, with monster training similar to Pokémon. The battles are dynamic, and you can team up with your friends for co-op gameplay.

Game Name: Fantasy World Souls

Itchio(free): 

https://decinbr.itch.io/fantasy-world-souls/

Steam(paid):
https://store.steampowered.com/app/2301370/Fantasy_World_Souls/