Just beat the Boss and kept the blanket, here are a few tips for you: Chapel boss tips
Main Tip) - remember what are you doing for each phase, it will take you far.
1) Try to keep all orbs nice and together.
2) You can jump and crouch to control orb height and how clumped they are.
Phases tips:
Phase/Lantern 1) Start by jumping in the middle when orbs spawn, then go right. Gotta keep them nice and together for this phase and the others. Then jump on platform and up to "lift" orbs and give you room to go under them. Then improvise, by now the situation gonna be varied for each individual.
Phase/Lantern 2) Start all way right and make one or two jumps to "lift" orbs. Then crouch under "middle" of them to clump them up. Then it should be much easier. I noted that "purple sparks" start coming down after "pink pathways" got "completed" (or at least the nasty sparks)
Phase/Lantern 3) Start by going all the way left, thats where first orb spawns. Because you are all the way left, orb gonna fly up, turn left and away, you should go all the way right now. Next orb spawns all the way right, make it fly right, then jump on right platform as long as you can, then avoid orbs and go left. While going left try maybe crouching next to closest orb to your right to keep orbs lower and clumped-up-ier. There will likely be a point when 3 orbs will be closing in on you, and then you have to jump over and between them and another orb coming from top-right. Be wary there also may be a point where you have to jump over 3 orbs and there are sparks coming down, then probably you have to time it so you can make it onto left platform before orbs hit you.
Phase/Lantern 4) For this I personally started all the way left. Wait until first sparks show, then go 30-40% of the room right to control where the next orb spawns (this is made to try and keep all orbs together). Then repeat this for 3rd orb. After this it's kind of the fiesta. Now orbs probably begin coming down more frequent, shorten distance to 15-20% or maybe even try staying close to closest orb for the next trip to the left, watch and try to keep orbs together. For this phase, try crouching a lot to keep orbs low, by the end I was staying close to closest chasing orb.
Phase/Bigsucc 5) I tried running left and got poked a lot, then jumped on left platform, paced myself, and it was over.
Hope this helps