Whats the Deal with Mine Flayer?

[Wel Wyrmin]

Okay. I find other bosses on that floor relatively easy, but mine flayer... OH MY GOD I absolutely hate that thing...
I've reached Bullet Hell and Liches Third form mutliple times but I can't figure out how to defeat mine flayer without getting hit. His attacks are hard to dodge and if you manage to dodge you get stuck in room corners...

[Inky]

me too. this thing seriusly needs a nerf

[Liy4b-Derg]

agreed. i've never flawlessed him even with Bullet.

[Helly]

It becomes on par, if not easier than, Cannonbalrog once you work it out.

• The mines can be dodge rolled into to force them to explode without you taking damage, although be careful as this may send you flying. Try and stay outside of the mines' radii entirely, rather than timing when it isn't looking, as you need to be focusing on the bullet pulses coming from the Mine Flayer, as they can easily catch you off guard even with as thin as they are.
  
• The bouncing bullets attack is easy if you stand against a wall.
  
• The bursts of bullet rings always curves out to either side, you can either stand on their parting point to avoid them completely, or get against the wall and go between the gaps, dodge rolling over the more dense rings.
  
• The bullet spiral attack doesn't really have any trick to it, just get as far away as possible and try and snake through the gaps - similar to Bullet King or Gorgun.
  
• The attack where it splits into bells is easy, just focus on the bells that split off from the main group, that way if you have any left when the Mine Flayer reappears the resulting bullet waves will be closely packed and easy to roll over. Alternatively, use an explosive, piercing, or melee weapon to attack all the bells at once when Mie Flayer drops them and they're still grouped up - if it's strong enough you'll have either only one ring, or even none (in the case of explosive or melee) to jump over. Try not to kill to many individual bells at once, as the bullet rings can easily overwhelm you.

Summary: Stick to the walls and hope the mines don't screw you.