Interesting visuals. Picking up weapons and leg parts from downed enemies is neat, like salvaging parts from wrecks.
As another mentioned, I had a bug in the 2nd level where the audio kept switching from the left and right channels which was rather uncomfortable. Didn't see a huge difference or a difference at all with changing legs? A few sound effects, such as this high pitched one, were a bit grating to me.
I had another issue with the camera, where it seems like the camera goes through the wall behind me or the ground when aiming up usually. Some of the NPCs also seemed to be stuck/inactive. Even while approaching them and shooting at them.
I don't feel armored core too much but the opening text and music captured that feel.