This game is a lot of fun! I'm not sure how you handled the spawning of the spiders; if there were just set points they'd show up, on a timer or whatever, but it had the feeling of Alien: Isolation where it seemed like they could pop up anywhere, any time.
I would have definitely put a pause menu in there, however. And it may just be my setup but for me the cursor was wonky - it was still active on my 2nd monitor while playing.
But yeah, this is a rad game!