This is a list of minor bugs and some details that are a bit annoying imo.

-The ritual circle spawns always in the middle of the room, but there are some rooms that have something in there, like a blood machine or a beggar, so it's imposible to activate it unless you remove the other thing (get the reward or explode)

-The circle appears in the mineshaft area (where you get the 2nd knife piece)

-The blood shards appear just over the trapdoor too often, making it imposible to get unless you move it (with a bomb or something)

-If you have PeePeeDie item and you deal a lot of damage to it when it spawns, the boss music stops, thinking you already finished the combat (this is what I think, but maybe this happens under different conditions too)

As an extra I would appreciate a mod config menu option to move the blood shards counter, as it is in the same place as tainted isaac's items list.