This is an interesting project with some really high potential.
While I love the music and the sprites along with the addition of moving enemies with functioning enemy AI, there are aspects which could use some improvements. Before I talk about that though I will elaborate a little on the above.
The music is at a pleasant volume and didn't require adjusting which is an often overlooked aspect of sound design. It was also a very pleasing tune that made me want to keep playing so well done there.
The sprites are very well made and frankly they look amazing. The animation on the Hollow Mage is also a lovely touch which brings life to the MC. It's a really nice use of pixel art and goes to show how good pixel art can still look when done right.
I also liked that the enemies moved towards the Hollow Mage when you approach them, Enemy AI is not something I've seen in these game jams before and I think it's great it was in there.
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Okay, so that being said the level design didn't work hugely in favor of any of these things. The spikes and the platforms could have been made placed with a bit more of a linear progression in difficulty instead of being immediately greeted with two enemies at the point of spawn and platforms that were not visibly on the screen and thus created a leap of faith effect, which seemed a bit harsh even as the final challenge. Also as much as I love the music I did feel like the music was a bit at odds with the combat, perhaps with the right sound effects and added animations this could be resolved. The feel of the music took me to a tavern or a small town. So perhaps having that shown in the background or in the strangely large amount of space, left of the spawn point, would be a good idea. One last minor thing is there appears to be a slider with seemingly either no obvious use or possibly no use at all in the options.
With these things reconsidered this could be a fantastic little fantasy adventure platformer!