Why did I die when hitting a red guy? It he a hacker? Has this game tried to turn into a stealth experience, where I must avoid them (which is impossible in the narrow office)? And how to people turn red; do they turn by using red computers? Are they computer virus zombies???
Anyway, I think this is . . . alright. The map is huge, and I have a feeling you made the MC run fast to make up for that. Good on you, but it still isn't enough. Maybe when a CPU goes red, make a screen flash and have a giant arrow leading me in the right direction. Or a minimap at the bottom of the screen that shows where every CPU is and when one goes red. Or an assistant NPC who leads me in the right direction. Or simply an annoying alarm. Just something to help me know when a computer's red, other than stumbling across it.
Also, the stairs contribute to the difficulty to reach a computer. The stairs can be far away from my destination, and I need to jump from them multiple times (from a rather high point on the stairs, for that matter) to reach it. And I have fixed zero computers so far, because I have stood in front of those red screen and held down Z, but it shows no indication of being fixed, still flashing red as I step away helplessly.
Two more things: the MC looks like everyone else, and that's kinda a problem. On my first playthrough, I was staring at a man in a black suit, wondering why he wouldn't move on my command, then looked up and realized I was a different man in a black suit. Especially in a game where you die by running into red-head virus people, it's important that the MC can be distinguished from the other characters.
Finally, the deception theme. Sadly, I did not see a trace of it. Let me be frank: it feels like you made this game, realized the theme wasn't there, and just threw in some text to make us think it's about deception. Well, it doesn't feel like deception at all. Maybe if every time you fixed a computer, you extracted some mysterious files that talk about the firm's downfall and tell more about the hacker threat (some lost e-mail, a meeting transcript, etc.). Maybe the twist could be that the firm hired the hackers to get rid of their secrets, and you just happen to be in the line of fire.
The deception theme could spread to the red-head virus as well. Maybe if one person is red, but doesn't show it, but you know there's a threat in the company based on your information. By hacking the computers, you find them before they find you (which would actually make keeping the MC's black suit to your advantage, so he looks like everyone else to divert the threat). Just some ideas.
As a fellow entrant in ths C2 Jam, I nod at your effort, but I feel a lot more could have been done to this, on many fronts.