Hey, pretty cool collab! I love that you went the extra mile and made the collab into an entire game, being this cool scavenger hunt adventure game through a spooky house with some great, stylish graphics. Collecting the tapes and bringing them back to listen was pretty novel and creative: well done!
While I do love the effort, I'll admit that there are definitely some parts I'd like touched up. For example, those default buttons and sliders on the main menu don't give that great of a first impression. But more than that, the gameplay felt a bit lacking in atmosphere: I wish there was more ambient noise, like the house creaking, tv static, dripping faucets, or the hum of the fridge, I wish there were sound effects for interactions like a little metal jingle when you pick up keys, and I do wish there were more spooky events, like some creatures popping up here and there. There were also some confusing aspects, like how interaction points don't go away after interacting (like picking up keys), and that trying to open a locked door only gives you feedback on mouse release, instead of initial click.
I'll also say that the execution of the tapes felt a bit clumsy to me. I really wish you could listen to the tapes on the go, similar to audio logs in modern games like Bioshock, Dead Space, MGS5 and so on. Having to not only stop your adventure to go all the way back to your room to listen to the tapes, but to then have to just stand there and listen without being able to move around and continue adventuring, felt like a bit of a bummer. I know you want our rapt attention, but it just felt like overkill, haha!