Bought it from seeing the animations alone. Top Notch. Wonderful and surprising style (i.e. waterfall).

Character controls and speed are extremely good, almost perfect. I particularly appreciated the upward freedom of motion. Pacing though levels may be a little slow. Enemies are cute and dangerous, and killing them is extremely satisfying. Level design is very good and secrets are intriguing. Music and audio are very good as well.

Maybe the title is too generic. Valley may be a little misleading as we play in a dungeon. Not a fan of pressing "A" for bow, I'd prefer weapon and items switch.   

Overall it's already a very good game with a proper identity.

I would suggest to introduce light procedural respawn of enemies and room design for extra replayability.