Menu theme: Oontz Oontz Oontz Oontz but in a lovely way! I love how pillowy (is that even a term? :D) and warm it sounds. Love the melodies!
Game Start: Such 80s on the drums! :D Great!
Stage Theme: Acid! Here we go. I'm picturing us driving on the fast lane. Adversaries and skyscrapers zipping by. Really like the distortion you put on that 303. Nice and growly.
Boss theme: This is a well done boss theme. For some reason, I'm getting a bit of a racing vibe, but also a bit of a halloween vibe for some reason. I can see why you called it digital wraith now.
A Last Embrace: All's well that ends well. Definitely a nice sendoff with some good vibes. Love the pillowy brass just bassing away in here :)
Excellent soundtrack!
Edit: Forgot to add, my favorite is probably the Menu Theme. Definitely going on my regular rotation that one!