The demo was good fun. I liked the small quests and the characters as well as the 90s berlin nighttime vibe. I had a few small technical issues when playing. There was no sensitivity slider - it was too low for me and got quite exhausting to rotate the camera after some time. The first time I loaded into Neukölln I fell through the map. I tried again and then it worked. I fell off the balkony and died to fall damage for seemingly no reason after lockpicking the vent outside the cultist base. Also, maybe you could increase the movement speed to get around city a bit faster.
Overall, I had a great time and I wish you the best for the project :)
Greetings from Austria