Just replayed the Hw1 remastered campaign in the latest patch 2.1 and I will write about things I noticed while playing in comparison to vanilla:
Mission1: I had it once that 2 harvesters got stuck on 2 very close asteroids to each other.
Suggestion: Check for those 2 asteroids (the closest to another another , there are only 2 and put em little further ahead of one another.)
Mission X: Turranic Raider Ion Frigates lack their cloaking ability when captured (disregard that it was in Cataclysm). Furthermore once captured they don't play their proper firing animation when firing. That means opening their wings while engaging. Please fix that.
Missions Garden of Kadesh & Cathedral of Kadesh: During those 2 missions I've seen it numerous times that like 20+ fighters just sat next to their motherships doing nothing. Basically a similar situation that others have posted screenshots about of AI skirmish matches. It's clear that some scripts don't execute properly or get overlooked during gameplay. Refueling scripts for the ai fighters also barely worked as intended though it clearly was better than before v2.0.
Last Homeworld1 Mission: Still far to easy. This is the last mission of the game and I'm serious about it that this should also be the hardest mission of the game! Enemy fleet reinforcements are off time and therefore making this final mission like a walk in the walk. I do understand that you lowered difficulty and that this is also a sacrifice which was being made during incorporation processes into the hw2 engine. In all honesty the whole campaign lacks difficulty compared to the original. Considering that players can no longer cap unlimited numbers of enemy ships you would actually assume that it's x10 harder but it's not. In fact it's x5 times easier than in vanilla. Investigate and at least fix the timer regarding enemy reinforcements in the final mission. 1 final fleet spawn is still missing to this very point since release- unacceptable.
General game thing both for SP and MP: The Hw1 faction cloaking abilities are a joke compared to what they used to be in vanilla Homeworld1. Granted in it's original form it's significant over Homeworld2 factions they do however got their own little toys to play with for example the Platforms which can be used in an offensive manner.
Just 2 days ago I had a guy tried to rush me with 20 Ion beam Platforms and my Mothership barely made it out. So I'd like to ask to restore Cloaking abilities (including the Kushan fighters) to their former glory. It just adds additional significant strategies to the game and the different factions. It would also make proximity sensors very well once more important again.
Other than that good work. I didn't encounter anything else that would cause for alarm. You're close on reaching perfection here.