I'd like to see New Game + be more than just porting over your A-Team Marines.
Adding more difficulty to the game as a Option would be great since as it stands, A:DD is very easy to cheese and beat even on Nightmare+NOCHTS Mode once you realize the game hands you tons of infinite crutches.
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NG+ Should also have an option to make it.. I don't know. More grounded? Like an OPTION for a "Realistic Mode" that you can only unlock after beating Nightmare once.
I'd like to see these changes for a NG+ Realistic Mode
1: RPGs, Mines, Grenades, Flamer Fuels, and Sniper Ammo all become their own resources instead of using command points.
2: Motion Trackers with how big they are, should take up a sentry gun. So, do you wanna deploy with 4 MTs, 4 SGs, 2 of both? 1 and 3? etc. It'll make you think instead of spamming.
3: Ambush Vents to NOT show indicators how they do. But instead you need to pay attention to sound and subtle visual cues. Include more ambush points like ceiling drops, and damaged floor panels. This will make you slow down and assess the surroundings better.
4: Queen Areas... Shove in 2 praetorians, a lot more eggs, and goodness make use of the hive to allow for ambush nooks (Like where Xenomorphs curl up and slumber inside of). Easy to miss sure, unless you can spot the curled up beasties.
5: Expanded zones and side missions that offer High Risk recovery of materials and resources.
6: If your whole team dies, that's not a "Reload" it's a "Keep going, all the way down to ONE single marine being left, with the option to go on a side mission to recovery/rescue people to recruit. But if that final marine on the otago dies, game over.
7: Xenomorphs - Instead of just "More HP like Fireteam Elite", overhaul their AI and spawn vectors to be more terrifying and a threat. If you trigger a massive wave, they should pour from all directions instead of just one tunnel. More warriors instead of just drones. Have them Adapt to the Player. Use MTs to distract a lot? They start ignoring them. Hold up in a box room all the time? Floor panels and ceiling ducts. Cheese? They learn your cheesing and look for other means to kill you.
8: Death is fast for both xenos and humans. So stress and accuracy would be the most important factors. Going in to kill a Queen? Better be fully prepped and charged up to deal with it.
9: APC doesn't have infinite ammo.