Hey there!
Here are my thoughts I have after playing Lawang Sewu:
I like the intro, quick and doesn't explain too much, the voice acting sounds realistic and puts the player in a right mood.
I wondered around the basement for a bit, wasn't sure what I was supposed to do, found a weird looking door that I believe said "Keep out", and then as I turned around there was a lady crawling my way and got me.
I played a few more times after that, found one missing room, it just lets me walk off of the map and fall into infinity (I think you're aware of that already though). I found some hallway where I can't go through an invisible collider, although I think I heard something behind the walls in that area, but never saw anything.
I didn't manage to escape the basement, but as I now see in the screenshots there is more to this game.
Maybe I should give it a few more tries to find something I've missed.
I like that the game doesn't have unnecessary loud jumpscares and maintains its tension really well, although it could benefit from some more subtle ambient sounds and noises from time to time.
But as I said I probably didn't see everything that's there to see in the game.
Anyway, pretty spooky!