Enemies grow tougher as the day goes on: their health roughly quadruples between 9 AM and 5 PM, and they hit harder in Overtime. New types join the office at set times.
Workaholics

Workaholic
A coworker who opened the "mandatory synergy" email. Shuffles toward you mumbling about deliverables.
๐ก They are slow. Keep moving in wide circles and let your weapons work on the edge of the crowd.

Caffeinated Sprinter
Four espressos deep. Fast, fragile and absolutely vibrating.
๐ก Fast but fragile. Area weapons and Reply All delete them before they reach you.
Paper Swarm
Loose TPS reports caught in the HVAC draft. They flock together and swoop through the office.
๐ก Swarms fly straight through the office in a flock. Step aside, or meet them with an aura.

The Temp
Crash-test dummy from the safety training. Runs at you and goes off like a fire drill.
๐ก Kill them early. If one starts flashing next to you, move away: the blast hurts.

Spam Bot
An automated outreach robot. Keeps its distance and fires unsolicited envelopes at you.
๐ก They keep their distance, aim with a red laser sight, then fire. The sight stops tracking you just before the shot, so sidestep when it locks. Only Spam Bots on your screen can fire, only a few aim at once (3 in the morning, up to 8 deep into Overtime), and envelopes fade out after 12 m, so a crowd of them is a pattern to read, not a wall. From 4 PM they fire fans of three, and elite Spam Bots fire five.
Copier Mimic
PC LOAD LETTER. The photocopier has had enough and now hops after you, jamming everyone it lands on.
๐ก They hop slowly, so dodge the landing shockwave. Lots of HP, lots of experience.

IT Ninja
Silent, hooded, slightly smug. Blinks across the floor in sudden dashes.
๐ก Watch for the pause before a dash, then sidestep.

Overworked Brute
Has not taken a vacation since 2009. Huge, slow and very hard to stop.
๐ก Knockback barely moves them. When one stops and a red circle fills under it, get out of the circle: the ground slam hits hard.

Middle Manager
Elite. Carries a Supply Crate full of goodies. Wants to "circle back" with you, permanently.
๐ก Elite: worth it. Each one drops a Supply Crate that can evolve your weapons. Like Brutes, they telegraph a ground slam with a red circle.

Sleep Gremlin
Overtime hallucination. Tiny, fast and in packs. Probably just a coworker, but it really does look like a gremlin.
๐ก Overtime only. Come in packs and are very fast, but die to almost anything.

Shadow Demon
Overtime hallucination. Walks straight through desks and blinks toward you in puffs of smoke.
๐ก Overtime only. Ignores desks and blinks closer. Keep moving so it lands behind you, not in front.

Grey Abductor
Overtime hallucination. Keeps its distance, locks on with a green tractor beam and drags you toward the horde. Break line by moving away.
๐ก Overtime only. When it locks on (green ring), it pulls you toward the horde, but it can only lock on while it is on your screen. Kill it fast, or walk away from it: the pull is weaker and shorter if you move away.

The Auditor
Arrives at 6:00 AM. Cannot be damaged, slowed or stopped, walks through walls and gets faster every second. Another one shows up every 20 seconds. Nobody survives an audit.
๐ก
Bosses

The HR Rep
Noon boss. Pens you in with caution tape, lobs policy memos that burst in a cross, and calls a conga line for a "quick sync". Lure her into her own tape.

The Synergy Consultant
3 PM boss. Tethers interns on live Synergy links, throws buzzwords that circle back, pivots mid-charge and dives under the carpet. Bills by the hour.

The Regional Manager
Final boss at 5:00 PM, one on one: everyone else goes home and he drops in piloting the EXEC-MECH. Eleven attacks to learn, burning rocket craters, a meltdown at half health, Yes-Men after it and a final stretch where he layers them. Beat him to Clock Out.

The Sandman
Overtime boss at midnight. Showers you with rings of sleep dust and calls in swarms of Sleep Gremlins.

The Nightmare Manager
Overtime boss at 3:00 AM. The Regional Manager, as you will see him in your nightmares. Faster, angrier and impossible to reason with.

The Firewall
Server Room noon boss. A security robot that blocks everything, fires dense rings of packets and spawns Spam Bots.

The Mainframe
Server Room final boss at 5:00 PM. The machine that sent the synergy email. Every attack in the building, and then some.