The two marrows on either corners of the map can shoot through walls and kill catgirl quickly.
However, they can only shoot in the (up/down/left/right directions).
Additionally, there is a small delay between their barrages and when they turn to aim. During this time, catgirl can safely cross their path and even dash through their core.
Touching a marrow's core will fully reload catgirl's gun (only when she is not the blue or orange variant).
Decorative lines on the floor shows paths to take to reach difficult spots.
A notably difficult place is the center of the map (where the F1 sign is). To reach this, catgirl will have to go down the bottom right corner, guarded by a marrow.