With 1 OMEN, the only SIGILS I have access to is the TOWER with the angels, that plateau with the dead behemoth seeped blood on the floor (where I cannot do much), and TOWN. And I guess the BATTLEFIELD too.  I have a RIPPLE EFFECT of 3– the two things that changed my RIPPLE EFFECT happened in town. I think one was helping the lady get her GUIDEBOOK and then it was moving that family of three to a new home. I'm not sure what I'm supposed to do next and honestly I'm not sure what I CAN do.

Does GIRL say that you can hide in bed?  I would try HIDING IN BED at HOME and leaving it for a minute or so.

Edit: That's underneath the bedcovers, also.

You might also return to the DESERT with ANGELS and donate DEAD BONES to the person at the topmost campsite..

It is also worth noting you can reach I believe OMENS 5, and around 12 or 13 RIPPLE EFFECTS.

I didn't realize you could get CURSED by hiding under the bed. I thought those tentacle things were just a little neat aesthetic thing that happened. 

As for the DEATH TOWER, I donated a lot of corpses to the person near the beginning of that level and nothing happened. How many of them are there to find and collect?

There are 6 DEAD BONES, and regardless of donations you can afterwards find TENNIS BALLS at HOME.