Thanks a lot for your playing! That's really important for me!
Yeah, My idea was to test this horror concept—especially since it could only be implemented in a top-down shooter.
What about tutorial.
On one hand, it really is missing. That’s precisely why an 'H' key was added in the patch, so you can always check the controls. :D
On the other hand, I never saw a tutorial in any Sega game. Back then, games were, in general, extremely unfriendly.
Perhaps as a compromise, one could have set things up in the starting room—showcasing all the gameplay elements with on-screen button prompts. It’s an open question, and an interesting one to ponder. In any case, thanks for the feedback. 
*monster hugs*