Update 2

Added the first boss of level 5

Arthur The Executioner

2000hp

you can deflect his spinning Axe attack by shooting a icicle into it.

For his second attack where he summons axes on you, just dodge them. the axes dont cover everywhere.

for his 3rd attack if you can dodge the slashes, do it. but if you cant, you can survive blue slashes by not moving, and survive yellow slashes by moving  just like undertale.

to survive his 4th attack.. you should pray to god. it spawns like 100 spears.