Puzzles are nice and simple so far though I do hope it does get more challenging or more unique puzzle features. The gun/battery mechanics feels quite similar to the game "The Turing Test". Maybe you could get some puzzle inspiration there. Finding all the crooks and crannies with PDAs as well as the cameras all tracking you are great/fun details.
I feel like the story could use a little more personal background/detail about the player character him/herself though I understand the story is still probably a WIP.
Also batteries don't have collision with elevator platforms as they move. Not a big bug (Maybe its intentional?) but I do think there is potential for puzzles that require you to move batteries with the lift.
Also just curious, did you draw any inspiration from other games? If so, which games are they?