I think it's good to focus on a good battle system and not too stupid AI. Every team has it's limits. At the moment as I see there are 2 people working on this, so we can't expect a game as deep as dragons crown or the later Capcom brawlers. Could be the target but this would take years to make I assume with this small team. Better set goals what can be achieved with the team in a good timeframe and work on it. As I read your inspiration was moonstone? Which by itself is not a really good brawler/hack and slash from a design and control viewport. Therefore maybe better to insure controls from games like the Capcom cps1 brawler, konami brawlers like tmnt, golden axe or streets of rage. There are brawler which are way more complex with controls, like battle circuit (which has 4 player and RPG elements and sick combos), alien vs Predator or the ultimate brawler imo "Guardians" which has the best combo engine to date for a arcade brawler.