Some couple game concepts I feel could be implemented, because I like this little game:
(ENTIRELY OPTIONAL)
A mechanic where when and how you die can affect your next run, say getting stabbed to death means an extra fragment found when hurt, attacking may give a pill if you died to the members of the cult.
maybe repeatedly attacking the same enemy may yield a unique variation of the same fight.
Perhaps a new status effect or two.
These are my opinions, and it's alright if they are not integrated. Still a cool game, 9/10