Overview
These are arrow patterns to beat the Mother boss without taking any damage.
tl;dr
1) ↑ → ↑ ← → ← ↓ ← → → ← ↓ →
2) ↓ ← ↓ ↑ ← ↓ ← →
3) ← ↓ → ↑ → ← ↑ ← → ↓
4) ↓ → → ↓ ← ← ← ↑ ← ↓ → → → ↓ → ↑
5) ↓ ← ↑ ← ↓ ← ↓ ↑
6) ↓ ↑ ← ↓ → ↑ → ← ↑ ← →
7) ↓ ↑ ← ↓ → ← → ← ↑ → ↓ ← ↓ ↑ → ← → ↓ ← → ← ↓
8) ↓ ← ↑ ← ↓ ↑ ↓ ↑ ↓ → ↓ ↑
9) ↓ ← ↑ → ← ↓ → ↓ →
#1
up right up left
right left down left
right right left down
right
#2
down left down up
left down left right
#3
left down right up
right left up left
right down
#4
down right right down
left left left up
left down right right
right down right up
#5
down left up left
down left down up
#6
down up left down
right up right left
up left right
#7
down up left down
right left right left
up right down left
down up right left
right down left right
left down
Thank you, Danichka4, in the comments!
#8
down left up left
down up down up
down right down up
#9
down left up right
left down right down
right