Hey thanks! Only expansion I used was VRC6 which was used for the bass, 2 of the leads, and the arps towards the end. No DPCM. The funky groove is indeed achieved with 0CC's groove tables, this groove table is 4, 6, 2, 5.
I agree the ending could be improved. There were 2 hours left to submit when I submitted this, plus I'd been working on it for 3 days, kinda ran out of steam and wanted to put a cap on it. Glad you liked it!