It's wonderful! I really enjoyed playing it. It is a great 3D platform game, which is my favorite genre. I suggest working a little bit more in the character's movement to feel it a little bit better. The level desing is very well done, and I really enjoyed the music, but about the last level on the alpha's music, I guess it doesn't fit the enviorment, so it might be good to change that.
Talking about movement and enemie's hitbox, well, I got stuck between a rock and an enemy when I tried to stomp on him and had to restart the level. Check it xD
I add a screenshot.
That's it. I'll share it with friends to see what they think about.
Good wishes to you. I hope to see it on steam soon!