I streamed the game for friends, we all really enjoyed it!
The papercraft aesthetic is beautifully realized, allowing the horror and humor elements to shine. There's a lot of clever asset use. You're working largely with big, flat, uninteresting geometry, but slapping a cardboard texture on it brings the game to life. We spent a lot of time simply looking at the environment, smitten by little details.
It's mechanically very interesting as well. Movement is floaty, but feels like it could have a high skill ceiling. In addition to the double jump and kick, you can use the crouch slide mid jump to move pretty fast. Going fast is fun. Using slow-mo while going fast to perform needlessly complicated movement tech is fun.
We were also intrigued by the limited ammunition. It made weapons feel somewhere between survival horror and special ability. I'd like to see it explored more. It's a refreshing take on boomer shooter gameplay.
My critiques are echoed in other comments, and like everyone else I'm also very much looking forward to the full release.