Oh, some kooky drum solos and arps here. Must be fun ahead. Although, I can't say I'm a fan of your instrumentation, or at least how dry it sounds. Vocals are also muffled and a little hard to pick out. Kinda pitchy too. The song honestly probably would have done better without them. They sound kinda meandering, muffled, and just don't sound great. I would probably chorus the harmony. The vocals are sitting in the middle of the mix like a sad sack, making everything else also feel sad and sick.
You may just need a better mic, but it sounds like you're singing through a bunch of socks rather than with a windscreen or something.
Key change at the very least provides some fresh interest. You've got good melodic offerings, but that one thing makes the whole thing fall apart like a wet paper bag in places. The vocals don't cut off at the same times as the instrumental, kind of drag in places, and then FX make the release even muddier!
The song does grow on me, though. You'll get there. Just look up some vocal mixing tutorials to help you. You may benefit from ReaEQ from Reaper's free plugins. Compression and EQ would eliminate a lot of that wavering volume you have going on here.