The way I see it, it doesnt matter if it ends up being the very best game ever created. Playing in the tiny screen of your phone is wrong for a game like this. Imagine they confirm there is an Alien tv series in the making, but somehow you wont be able to see it in a TV, only phones. It would suck just as much and I hardly think anyone would defend that.
Also, on a personal level, I've spend lots of money on having a gaming PC, and a PS4 Pro with PSVR, and a Nintendo Switch, I'm not algo going to spend money on a $1000 phone just to play a game (even a game I really want to play). I dont think my third-hand $100 phone is able to even install this. Phones are for calling and texting, maybe a casual angry birds game. Alien deserves more than this.
However, I hope that this sells well so in the future they consider porting it to PC/consoles. It has happened with other mobile games, I think.