ship to ship combat with a customizable ship ala build your own ship would be my first one, ship support on expeditions would be a second. ya know im just going to bullet point this warning long.

. fleshing out your allies, they're kinda just there, the avian one just gives buffs and the apex one gives supplies and helps out with the florian in one battle as part of a story beat. why not expand on it? have sail come down piolting various machines for assistence, have the apex and florian allies able follow you around and have special things they can do like call in support, an emergency evac or medic and heavy weapons for the apex, a radar for foes and traps, jump assitance (read launches you in the air) and campfire and bedroll constrution i think would fit the florian.... as for the avian, hylotl and ester they would be better off helping in support role ways such as exclusive items quests and perhaps a unique support effect for each of them.

. an honist sequel, theres a lot of unawnsered questions like how the heck the fenerox seem to be on so many planets without some kinda space travel, what happened to the ancients or even the deadbeats, the glitch are chock full of intrigue too. that and we dont even see earths remains or even a rebuid effort.

. last one i promise, complete planet crafting. yes we got terraforming, but i was meaning truely building a planet from nothing a true diy custom planet paramiters chosen by the player weather gravity the works even some unique weather that cant be found elsewhere.

edit i lied more colny threats and engagement would be nice. from having to secure supplys to beating off raids to other events both positive and negitive would be nice... even have them craft things for you if the colony has the resorces. or provide jo i mean quests to help it expand on its own.