Although not officially released, we managed to find it. Do note however that this was a work-in-progress title and is full of bugs, rendering it unplayable.
Resident Evil 1.5 is a PS1 game that can be played here for free on playretrogames.online using your web browser. It was added on 16/3/2019 and has been played 29 times.
play resident evil 1.5 ps1