You're Right... More Can Be Done
Although chances are you'll be able to perfect it, I truly do like it the way it is. Everything just moves so smoothly together. It's actually beautiful to hear. However it is a bit repetitive, not a bad thing, but not exactly my style either.
I like what you got set up here, and with a splash of creativity you can create something wonderfully superb! Might I suggest the addition of strings somewhere, it may sound weird, but I think it could work for this song.