Sounds familiar... I hadn't paid any attention to mono compatibility, so I'm glad it sounds okay on the cube. It's due for another mix a few fixes, but I need a couple of weeks to get my perspective back. I should be posting a different original tune this week.
The vocals do sound low - at 1:28 the lead pops out - this may a reference to match it to. They sound a bit cloudy now - maybe it's just the volume.
There's nothing wrong with anything else for me. I like songs like this with all sorts of instruments coming in and out adding so much variety. Great tune!