Haha, very nice! It seems I am not the only one who thought about a rap-feeling and a hiphop-style beat. That initial sound reminds me so much of a particular game... Sonic Tennis for the DS or something, where it was used for the rapper-guy. Very smooth! And it fits the guy so well too.
I love that first melodic instrument! It's just some saw-synth or something, but it sounds so clean. And it has some glide on it, which just makes it so much more smooth! The cut-off staccato chords on that piano-like instrument also work really well. And you also use that one instrument that Toby Fox used for some of his songs - no idea what sample that is, but cool choice.
Very cool song! Especially given that you only used 3 instruments at once and "was doing this in the middle of the night and wanted sleep". Always makes me a bit annoyed, when people make it sound like they put no effort into their song and still put out such bangers haha. Great job, I'm keeping this one ;)