Pretty cool demo! Loved the design and animation of the main character, and using a golem to fight is a cool idea - reminds me of the guardian souls in Aria of Sorrow. I think it would be cool if you could see the golem at all times, or maybe at least have it show up while the player is idle (like I think it was in Ender Lilies). Personally I just love having visible familiars/pets following my character around!
On that note, I think it's possible to softlock yourself in the very first room if you use all your magic before you get to the roots blocking your way, since I don't think it's possible to regain magic outside checkpoints. It could perhaps be resolved by letting you regain magic with the regular attack, as I initially assumed you would. Also, the placement of the first pair of dogs you encounter seems a bit unfair, as you fall directly in the middle of them before you can even see them!
I liked the jump arc, it felt really nice and snappy. A bit of a shame we didn't get to play around with the double jump more. I guess the big dormant robot was meant to be a boss that didn't make it in, but it looked very cool regardless. Good job!