Tried out Mecha BREAK by Amazing Seasun Games and it's pure good chaos. It's a lot to take in and can be overwhelming when you start out but it is a fun game.
It's quite literally a PVP version of Armored Core and Gundam. It is every mech battler fan's dream. There are tons of customization features for both the pilot and your mechs.
Different mechs are available but they are (at least for now) locked by their roles such as Medium Attacker, Heavy-Attacker, Defender, and so on. While you can't change your weapons right now, you can add modifications to boost your mech's capabilities.
Since different Mechs have different roles, you are expected to do your part in matches. I personally love the Medium Attacker as it is very flexible in what you can do (and I love smacking enemies around).
2