The synth you used reminded me of 90s rugrats cartoon. A specific sound effect where i could swear they used a similar effect. So to me this sounds like a jazzy spin on rug rats. To me this sounds like one keyboard that allows you to layer sounds/samples over each other, what comes to mind is the jd-800? Im curious what synth you used for this hardware or software?
Also amazing work, takes true skill to rely purely on one instrument. A lost art form.