sounds very good! i have to note a few things though:
- better adsr for... pretty much all instruments would help a ton to make the song have a little more punch.
- i think the toms could be a little lower pitched to make them sound a bit more bassy.
- in terms of optimization, there are some hiccups. things like [d16.]2, [d32]4, [f16.]2, ..., are all actually increasing the insert size instead of reducing it, this is because the loop command in hex consumes some bytes for its proper calling and functionality; in practice, this makes it so that looping less than 7 notes in total will contribute to an even bigger insert size than if the notes were just left as is. take this into consideration for next time!