Bought all the upgrades and unlocked all of the work options, no idea how to get in to admin though.
Great game, I'd definitely reccomend it
Viewing post in Cog in the Vending Machine comments
just in case you want to come back and solve it by yourself:
hint 1: Check your email
hint 2: Even though the cola in 1-1 and 1-2 are functionally the same, they have different description
vvv |The Password| vvv
The email from the admin Jerry mentions 4 very specific drinks you can get from the vending machine: Sweet Coffee, Cherry Cola, Chocolate Milk, Omega Espresso. If you check each drink on the vending machine, you'll see they have different descriptions on them, specifically at 2-4, 1-3, 4-4, 5-4 respectively. Now, if you read the email again, you'll notice how Jerry like the number 1 and will start putting 1 at the start of everything. putting the 1 with the number you get from the specific vending machine drinks and you'll get"124134454", which is the password to unlock the admin.