Nice fast, snappy movement.  FOW works well.  Enemy AI is good.  I like the water effect.

The difficulty is very high.  Enemies swarm you and the limited space means it's hard to run away and avoid getting cornered.  They also seem to get tougher, but your player character doesn't.  Do they always know where you are or only when you're in their range?

Some music and sound effects would be a nice addition.

interesting aesthetic, i can appreciate how dialogue makes the world feel fleshed out. i think getting scrolls just slowly kills you? i haven't found any items besides potions and scrolls, and potions are the only ones that raise your stats or survivability in any way. items always seem to drop one tile away from the heretic you just killed, which feels odd to me.