First impression on booting up the game is that the main menu music sucks. I don't think I'll be listening to the soundtrack for this game if the main menu music isn't memorable.
Anyways, here's the choices for starting a new game:

There's fucking 3 choices to pick. Favorite part is that the choice menu cuts off the text dialogue (seen in my first screenshot). I chose Normal, Adventurer, and Open Map just for ease of access.
After a brief cutscene, we're presented the overworld:

I will say that I like the sprite work. It looks clean. This is a forced tutorial, you can't really interact with much here and there's only one way forward - Up with text detailing what to do. There's an enemy here and we're prompted to press X to attack. This brings us to actual combat:

Tutorial voice tells me exactly what all the buttons do which I personally don't like. I wish it just plopped me down into the game instead. The fight is quick, but I noticed that the BATTLE WIN music sucks. Sounds like a dying trumpet. I don't know if that's intentional or not. We'll see.
We talk to some esoteric mannequin and then we wake up in the real world:

Your friends all go inside the storm drain (they call it a sewer, but I'm like 10% sure this thing is a storm drain). I decide not to go into it and instead climb the ladder which, according to our friends, we fell down from which caused us to briefly get knocked out. I'm fairly surprised that I can actually climb the ladder here and adventure forth.
You can see that there's something a little messed up going on in the town if you explore:

There's two NPCs that make reference to people watching from the trees, but it's a nice touch that you can actually encounter them yourselves. The balloon is a reference to the backrooms, I think. I'm not a backrooms expert so I'm just going to believe that I'm right.
Moving on, we get more tutorials via text boxes:
We encounter our friends and they jump in a mysterious hole that seems to vanish and reappear. Naturally, we jump in after them. After going down some sewer stairs(?), we get brought into the dead mall:

As an aside, I'm really liking the vibe of the game so far. Oh, I forgot to mention that EXP is tied to collecting these floating souls on the overworld.
We explore a little bit, I fall down an obvious hazard, and take damage. Next, without any cutscene or input by the MC, the lights turn off and the music stops playing. This is the best part of the demo for me. I really like that this happened suddenly
A little more putzing around and we catch up to one of our friends: Heidi. She gets into a speck of trouble and gets attacked by two slendermen. We dispatch of them quickly though.
Heidi mentions that we have to report this to the Hero Agency which I guess are just the psychic cops? We move to the next room and encounter a dead body:
Our new objective is to find the Sppedster friend to get out of the mall.
This is where they introduce the stealth mechanic to us. It reduces our field of vision while reducing the enemies' awareness range. As mentioned before, we do not level up by defeating enemies. This makes every non-boss encounter a waste to our resources. This wouldn't be as bad as it seems; HOWEVER, you cannot draw enemies from their initial spawn zone since they'll just respawn back. Take a look at this map:

I'm in the backrooms proper now and EVERY SINGLE corner has some sort of bad lying in wait that I can't just stealth past since they attack once you get ass-to-ass with them. I've opted to just run past everything, but there's also floor and wall enemies that ambush you when you get to close to them.
My sanity is pretty low at this point and I found it cool that the characters start to shake, but I couldn't get them to do it again so I'm not sure if this was a bug or not.
We follow the Speedster's footsteps to this cheeseman(?) who wants us to play a quiz to move forward:

He wants us to push blocks into their PROPER hole. Obviously every block goes into the square hole, RETARD. DO IT AGAIN >
Alright, shortly after you get past this cheese man you encounter a cheese clown. Now, he's different from the other enemies because he's red which means if he grabs you it's an instant game over. He grabbed me and brought me back to the puzzle cheese man. I super duper do not want to any more of this game. If my ramblings meant anything and make you want to play more, sure man. Go ahead and live your life. I just can't play anymore.