I like the idea of swapping out skills and trying new movesets. The deer enemy and the main character both had neat designs.
I found some unintentional fun in choosing the cartwheel, and getting behind the enemy, and then cartwheeling backwards into them over and over, which was more than enough to outdamage the boss. I wasn't a huge fan of how some attacks would launch them into the air so high, mostly because it meant extra time waiting for them to come down. But if they fell faster it could be a fun mechanic to play around with.
The platforming on the boss was neat.
Overall some good ideas, but very unfinished. Some neat gameplay that can be experimented with and expanded upon!