For better and worse this is a mostly upgraded version of Gundam Breaker 3.

Gameplay has mostly been improved from previous entries with each mech being able to carry up to 4 weapons (two ranged, two melee), with up to 8 recharging abilities that you must wait until their recharge finishes before using again, 4 that require energy from a gauge that you fill during gameplay (damaging others, being damaged, and potentially over time) that you can fire as often as you want as long as you have the energy, and a single special attack that requires filling a second independent from the previously mentioned gauge. You gain parts that grant you these abilities by going on missions and fighting other mechs that will occasionally drop their parts for your use. For the most part there is no requirement on what you can use so nothing is stopping you from unleashing an eyesore with all the best parts. In between missions you can upgrade your mechs individual parts with straight upgrades and specific tuning.

Abilities saw a massive upgrade compared to older titles even if you might find yourself favoring Macross quantities of missiles interrupted by the occasion nuke and/or funnel/drone swarm. After a part has been upgraded enough it built in abilities become available to any mech, allowing you for the most part to use any part you want with little concern of built in abilities. In addition you have 8 slots to add optional parts that might grant you access to certain abilities or just look cool. It does have some annoying visual choices on the part of the developer where if you use an ability from another part that you don't have equipped it will swap out that part temporarily with a wireframe version of the part that has the ability and all of the optional parts will return to the default mounting position when fired (meaning those 8 vulcan guns you put on your shoulders and torso will clip into each other when fired regardless of how far apart they were). It's doesn't really affect gameplay, but it annoys me.

Part selection is better than previous titles (except the mobile game) with a wide variety of mechs to choose from. In addition dual wielding of any ranged weapon and most melee weapons is now available and left and right arms now can be chosen independently allowing for greater customization.

The level design is a massive step down from previous entries, especially in comparison to Gundam Breaker 3 and New Gundam Breaker. The respectably sized levels have been replaced with a series of tiny themed but mostly empty arenas. Probably my biggest disappointment with the game.

Bots are as dumb as they come while still being able to be considered actual bots. Enemy bots rely on being damage sponges and having high damage attacks to be any real threat and can easily be baffled by terrain (probably why level design is so simplistic compared to older titles), and friendly bots are nearly useless with their only use being reviving you if your health is depleted (if ordered to and their AI doesn't get confused/distracted).

DLCs are so far, for better or for worse, completely unnecessary. Seemingly most of the mechs being variations of ones you will already have access to via the base game and no gameplay alterations that will put you at a disadvantage without.

As a new fan of the Breaker series and as a casual Gundam fan, I'd say that this game is pretty good ONLY if you focus on the customization, as I honestly think those are it's only good points. Making custom gunpla and dioramas have been a blast, as well as using said customs in battle, but as far as the story missions and PVE content goes, it feels really lacking. Probably adding an actual PVP gamemode may help though. My last issue stems from the lackluster DLCs and locking certain mobile suits behind them, and considering the price... Yeah no, that's the worst part of the game in my opinion.

TL;DR Only buy if discounted or something, base game's pretty fun but I can't recommend this game full price.

Fun game but game is frequent to crashes that require reinstalling the game, there is no information, support and any intention from the devs to fix the crashes