Love the simple art style - especially the little square guy with the tie, and the particle effects when you grab pickups. The incremental level design is a very cool touch, and quite a unique approach to the theme.
The controls are a bit floaty, which took a lot of getting used to, especially the lack of deceleration when you're in the air, and the music got grating very quickly. Good effort making the track yourself (I see Bosca Ceoil in your list of software there!), but even adding a second section to contrast the first would massively improve the listenability.