Wow, really nice game! Its polished and has a lot of juice!
I think the time cops spawn too often. Makes it hard to get by them because they can eat through all of your amunition really fast.
I also don't think the whole building should be alerted to you stealing the artefact, makes stealthing around a bit pointless (i tried this on the final level).
The upgrades were nice, but maybe there should be acurency system or something, personaly i don't like random upgrade choises, im not a roguelike head.
I liked the vest and stealth upgrades!