What a great and unique bullet hell! I made it to the third boss (the pink one) and I almost beat it.
Having to draw different signs using the candles to summon minions for attacks is a unique mechanic, really creative. But I found it most effective to draw the simplest triangle over and over. Maybe a per-ritual timed cooldown could combat this.
The art was great and cohesive, everything fit together. The bright colors contrasting with the dark background made it easy to read what was happening. I also liked the subtle effect on the floor. The sounds fit the game as well.
Overall a unique, creative, and well polished entry, great job!