As many others have said I think that neutral bases such as rebels, flood or sentinel should be added or made an optional thing which can be selected in the menus.
i would really like some halo wars maps to return such as blood gulch, release, fort deen, terminal moraine and so on. As well as more purely 1v1 maps. As for these maps, I feel that they need more things to make them unique such as having stations were you could buy protectors like in hw1 or being able to release the flood on release or those shield barriers like in fort deen. I feel that these sorts of features could make multiplayer matches more exciting and not so same old.
i found that when attacking a base with my army not all of my units would attack, instead just sit there, and I also found that not all of them used their Y ability when I clicked it.
Cutter-I feel as though cutter needs more leader powers that temporarily buff units and passive which focus on base biking, whether it reduces built time or reduces cost of building like a mix of atriox and decimus. I also think that ODST's should be able the be made in the barracks or main base and given the same upgrades as marines or new ones such as cloak or damage buff to cloaked units as well as a general damage and defence boost. And as a side note, him getting the elephants back would be nice.
Isabel-In my opinion she stands in forges shadow and only has ghost in the machine going for her. She should get something which sets her apart from forge but keeps her vehicular preference such as damage and defence buff when units are stationary. I also think that her not having a unique makes her less desirable so giving her hawks or even rhinos could make her stand on her own rather than being a poor copy of forge. Scorpions also need a buff such as faster attack speed or more damage.
Anders-I think that Anders is fine for the most part and is fairly balanced.
Forge-like Anders, I think that forge is fairly balanced but carpet bomb needs to be improved or replaced by archer missiles and warthogs need grenadiers, either just for forge or for everyone.
Kinsano-my only gripe with her are the leader powers but increasing the cool down could solve that.
Decimus-you might notice a running motif with these leaders so I'll preface it here, the banished leaders need a their own unique. I might let decimus off because he has himself and the warlord but the others I'll discuss later. Overall I like decimus and don't think he needs to be changed, but cleansing beam needs a need and the tracking to be not so aimbot from the ai's.
Atriox-he's probably my fave so far and was a little disappointed by his nerds as the invulnerability was the only thing which stopped my entire army from dying to one leader power. He definitely needs a unique and it would be so easy to just give him the brutes from hw1 but replace the jet pack with a spike grenade which acts as a mine or grenade depending on where it hits.
Shipmaster-his cloaking is nice but if you add a feature in which he gets garunteed cloak for a couple of seconds would be nice. He also needs a unique and I think that an elite squad armed with fuel rods and confusion rifles acting as anti infantry with cloak and shields would be pretty cool but a would accept anything elite related really. I also think that he should get a passive in which shields are buffed and have their recharge rate increased. I would also prefer if certain brute units were replaced with elites like in grunt squads or even replace jump pack brutes with an elite unit.
overall I think that:
-offensive leader powers should be nerfed and s disruption bomb added
-all leaders have their own unique unit alongside the hero
-maps should have interactive features and optional neutral structures
-we should be able to chose our colour within our team
-original maps and characters dlc
-more original and diverse maps
-more covenant based leaders, return of jackels and elites
-blitz units used in multiplayer as units or optional replacements, scorpion to lockdown variant
-unit skins which could be where blitz variants could be used. There could be skins to resemble covenant style or variants from the range if halo games throughout the years
-units I'd like to see as uniques or a unit fir everyone would be mantis, anti air wraith, hawk, wasp, vampire, rocket hog, revenant, gungoose, prowler
i hope you'll take my points into consideration and thanks for making a good game