This was a really fun 20 minutes. The atmosphere was setup pretty well. The monsters looked pretty goofy though lol The jump scares were pretty well telegraphed too so if you payed attention while playing, there wasn't much concern with getting caught off gaurd by a jump scare.
I agree about jump scares. Not really a fan of that style of horror. I think you did pretty well with building up the atmosphere. Especially with the segments were you made the player walk through hallways that looked like it should be 1 click, but ended up being multiple small steps through the hall, building up the intensity of expectation.
And hello from the USA!