Very polished overall, really impressive gameplay, sound/music, and visuals. Great introduction to the game. I do generally prefer the learning all integrated in some kind of tutorial segment (which you did do to some extent).
I'm a big fan of turn-based combat and I don't see it enough in jams - nice job! I also like the RPG mechanics that you implemented. In terms of the combat, it would be cool if different abilities interacted somehow or had status effects that were useful to win some fights - rather than purely doing damage, such as reducing opponent damage, or having a chance to stun them, etc. I'd like to see a bit more of a technical description of each move when you are hovered over them if possible (e.g. damage, other effects). I'd also like to see the enemy's remaining health and stamina during fights. Perhaps also consider having unique level up text for each level, or maybe randomised from a pool of different options.
The bird flying overhead is a creative way of giving us a "world map". The checkpoint system is also a nice touch, and necessary for games of this scope. I also like that you've done so much writing for the game. You've all put in a lot of effort and it shows :)
REALLY nice music, and great sound effects. Who did the voices? :D