Thanks a lot for playing!
You can dodge through attacks which the hand swipes, during the boss fight, are. This is the kinda video game logic that I think is usually accepted as fine. Dodging through enemies would remove too much of the difficulty.
Casting is explained when you pick up the Light spell. I made the design choice that tutorial stuff is very non intrusive and you can ignore it, so you must have missed it.
Font will change.
You can level up your endurance which increases your stamina (This is an RPG so your character will get stronger).
Thanks again for playing and for the feedback!