What a lovely story, simple and uncluttered and elegantly told, almost entirely without dialogue. We see a girl playing with her imaginary friend in various settings, and while it's quite sweet, there's also a sort of sadness about it, something you can't quite put your finger on. I was pretty sure there was going to be some sort of twist or reveal coming, although the stuff I had in mind was quite different to what we got. And what we got was a knife being stabbed into our hearts and twisted around.
If I'm looking for criticisms, I can maybe find a few minor things to quibble about. The 'rules' of the imaginary friend felt slightly variable in terms of what we were seeing, although perhaps that's just me missing some things. The final scene with the magic trick was momentarily confusing in terms of timeline, although the sepia filter helped to establish the flashback nature of it.
One thing I really appreciated was how much they trusted the intelligence of the audience at the end, specifically in terms of just showing the photo and trusting that we'd see the tube feeding into the girl's nose and put two and two together, without having to spell it out. The crushing nature of that end reveal is interesting also in that it takes you a few beats to first assemble what the reality is, and then contemplate what the ramifications of that must be for the girl, for the girl's parents, and so on.
(Also, I only just realised this was in the Buddy Movie genre - fantastic interpretation!)
This is probably the closest the team have made to a spiritual successor to their classic "Polaroid", and that's very much meant as a compliment. I enjoy all the flavours of what Submission Impossible can do, but there's something special about their ability to set up a platform then knock it down in an emotionally raw and affecting fashion. Great stuff.