Don't lose sight of the robotic opposition!
Locking on to your enemy is something that our inspiration played an earlier hand in normalizing than it is often given credit for. Naturally, this mechanic returns in Halcyon Days, taking after how it behaved in Mega Man Legends 2 rather than Legends 1.
Move freely about while assured that Ara will face down her opponent when it's time to fire. When locked on you can move the right analog to switch between available targets.
Here's a video of Lock-On in action!