I have a suggestion...
how about you make the next part "in the tunnel" with the monsters are spiders, bats, bugs and maybe like a sort of creatures that will catch Syahata and doing it in a secret kind of place
Also, don't you want to try by adding a voice to Syahata while talking in her dialogue? you can also try to make her really addicted with the monsters
will that be a good suggestion to you? well I just hope that my suggestions can be use once in a while..
