Very cool game, as i understand all or most of 3d models and textures and that very cool and big endeavour.
I finished the game but it felt like i had to cheese some parts.
specifically with dragon boss, he was just blocking the way, and i couldnt kill him, didnt know if i ever did damage him. ('cause there's no feedback)
lack of sounds really took away from experience, especially with dragon fight, i did not even knew if my hits connect.
I kept wandering what was growing in the sky
the text popping on every grave break and not pausing always guarantees damage, so i couldn't have used spruites as heal. Consider changing process on text canvas pausing the game (process when paused) so when game is paused canvas objects are active.
the ending felt a bit anticlimactic
this is not to say i did not liked your game there are just things to improve
It was a nice complete experience with interesting ideas.