The chords on the vocal must have been quite hard to sing -- you rarely hear them in comtemporary alt rock, punk, ska, and indie.
I would appreciate a bit less distance from the mic, recording at a lower volume to eliminate room noise. I think I hear some but I can't be quite sure due to vocal treatment. There are a few good vocal plugins I recommend also, for dialing in a quick rock tone, Howard Benson vocals being number one for rock, and Xvox for smooth lead vocals. Some very cool things that can be done with both.
Your adlibs were mixed perfectly imo. I wish the leads were given just a bit more of an up-front, aggressive treatment (the singing will speak for itself, given the right edge to cut through!)
I also like your writing in general. That little G#3-A-G# is one of my favorite riffs, and the felt suspension of G# makes for nice moody dissonance. Overall, the feeling of being flippant and slightly unhinged brings me a nostalgia like you wouldn't believe. Well deserved frontpage.
Areas for improvement -- clarity especially in the lower registers and guitars and vocal balance. EQ in some places, again particularly guitars. Having a reference or 3 handy in this genre and comparing the overall sound profiles, both auditorily and with a spectrogram, will help in this area.
Otherwise, this is nearing on industry standard level mix and master. Keep doing what you're doing! I love it :)