Love this to bits from the demo I finished and the full Episode 1 i got but...
A main complain that often really annoys me since the demo and the full ep1 I got recently from a friend as a gift is the inventory, I just wish we had more slots from the get go or heck if the game let us just use a cheat code to bypass the very limited space, I am even considering to just download cheat engine and see if i can find the right thing to modify to let me carry more stuff.
Or if that never happens, another suggestion I'd have is at least being able to do like a "to do" list that is on your screen at all times, a list of materials you aim to get in a run that day for some building project or gear, those mats could even have like lil highlight in the world so you know it's the ones you marked, instead of having to use a separate application to write it down or pen and papper as to what you need.