This is so cool! I can hear the Toby Fox influence with the upright double bass. The vinyl crackles give it a nice vintage quality and the piano line was very bluesy. The swing rhythm was well done and the brushed snare is a good choice for instrumentation.
I think you did a really good job, especially considering this is your first time making a jazzy track. The only thing I can think of to make it a bit more jazzy would be to have a section with more experimental chords with more extensions and maybe some borrowed chords. Overall you did a really good job Paper!