I believe the game does tell you how the Aim Assist works, but too early for it to be coherent to you. Same thing with how early the game tells you that Assault Boosting reduces the impact of enemy attacks and increases the impact of your own small arms fire. To me, the confusion over Aim Assist mode is caused by:
- People go "oh, clicking the right stick is the Dark Souls lock-on button, this is a lock-on that I press when I want to lock onto an enemy." It isn't a lock-on, and you also don't activate it per-enemy. It's an aiming mode that toggles on or off when you click the right stick and does not terminate when an enemy is destroyed.
- It's called Aim Assist, which is also not descriptive of what it actually does - maybe "Target Tracking" would be better.
- The UI elements for it are practically invisible.
The presentation of Aim Assist is probably the worst part of the game. Either you accidentally figure it out on your own (probably while stuck on a boss fight) or someone tells you.
I’m halfway or so through Chapter 3, and two of the available missions have a “Decision” indicator. Does this game branching paths and different endings?
Yes to both. For New Game, the only choice that
matters is the
only set of options in Chapter 5.
There's an additional ending in NG++ if you've seen both the standard endings and have completed every Arena battle. For
that ending, you need to
accept the offer made via encrypted communications during the NG+ variation of the Chapter 1 mission
Attack the Dam Complex and do all the decision point missions that were not available the first two times. Paraphrasing how Peklo put it earlier, just pick the options that are new to you each time through.
For the record, this isn't Dark Souls, nothing changes about enemy stats during NG+ loops. While new
missions can be harder thanks to harder encounter design, the game is
much, much faster in NG+ and NG++ since you'll be shredding through old missions with endgame parts and the pile of OS Tune upgrades you'll accumulate. If NG takes like 15-20 hours, NG+ and NG++ are both about 5-8 hours.
EDIT: Removed some ending advice