Yeap, this is a solid song. A good piece of songwriting from you. I'm really liking the Grey is my favourite colour hook with the little repeats.

"Colour" could also repeat, ascending in melody "Colour Colour Colour, grey is my favourite colour..." Into that sort of ending part or a bridge sec. Just to reenforce the hook even more.

A lot of these tunes would make good electronic dance songs, if you collaborated with a thoughtful composer/producer who knows their shit.