I really do like the implementation of the rails shooter and the scanning mechanic, with a good use of level design to push the player to use the scanning in multiple areas.
I do like how the rails movement feels and how it works together with the scanning. Although there seems to be no use for switching between the 3rd person and 1st person perspective.
You can maybe have the enemies pose a threat to the player have them move towards the player when they are visible?