Definitely sounds fuller than the last version, and catchier. There's still work to be done on making it sound 'wow', but we'll get to that in due course.
C - Bb - Dm - C is not bad of a progression, good going. Only, try to avoid too much repetition. You did build up the instruments, but if an outside listener were listening in, he'd want a bit more in the way of variety. Peaks and valleys, highs and lows. There's quite a lot to cover, but for what you've managed to cover, you're doing well. : )
Thanks! What do you mean with the C - Bb - Dm - C?