Your "low end" interface is worth more than my guitar and interface combined. Lets be realistic here
My biggest advice would be to post this in the MP3 clinic.
I thought it all sounded good but found the music boring .
As I started recording in the 1970's with Low End Gear, let me reassure you that nothing nowadays is low end, I should know, I have been to the bottom LOL.
Alan.
Cheers on your hard work guys.
The mix is really good.
I feel that the mixing engineer knows what he's doing, but he's limited on the sound sources.
Maybe get better drum samples, cause the mix is balanced it's just that you can improve the sources
But it's REALLY good, congrats!