In this video tutorial I go over the basics of making a level - floors, walls, objects, roof light obstructors, NPCs, patrol paths, and more.
Check out the game on Steam or GOG:
https://store.steampowered.com/app/2608270/Intravenous_2/
https://www.gog.com/en/game/intravenous_2
Social media
https://twitter.com/spnidelman
https://discord.gg/YwyKAJmmnz