Ok, I gave it another spin! I started at the correct location this time, and that helped everything flow better and make more sense.
The music is really good! It adds a ton to the presentation. Kudos to @lapspider45 for the excellent work!
The boss fight is a nice touch, I don't remember that being there before. One odd thing I noticed is when you hit him, he seems to stand in the air afterwards for a moment? Unless he's supposed to be flying.
I still got stuck at the same place. Once I hit the room with all the spikes, floating platforms, and laser turrets I just can't make any progress. I feel like that area could be notched down in difficultly little bit. (But then again, maybe it's just too much for me.)
Keep up the good work!