* SPOILERS*
Loved it! Controls, atmosphere and music are excellent. The morph ability is very versatile. I like how the fire before the boss is already lit so you don't have to choose.
Some suggestions:
- The way the spear attack moves you forward isn't really useful and often gets you killed. One thing to try might be to always apply knockback on a successful hit to either the enemy (if it's small) or you (if it's large) so that you don't end up overlapping it.
- Enemies being the same colour as their environment can make them hard to see, though it sometimes made me slow down and observe carefully, which could be good.
- Might be good to start combining enemy types in the same room before the boss.