i'd add release to the synth from 0:10 , which would give it a better swing, the synth at 0:14 sounds a little thin, i'd layer it with other synths to provide it with depth, 0:19 's note sounds off-tune, so does 0:34 , it seems to be a recurring note. maybe it's a note that I'm not a fan of I'm not sure...
i LOOOVE THAT SUB! I also love how the song is composed, it's charming I love it!! <3