Super polished indeed as others already said. One of the best entries no doubt. Really liked all the visual effects and the layout of the levels. I only managed to beat the dev's time on the 4th level:
The rest were just way too difficult for me to get anywhere close. Well except for the last where the dev's time was 12 minutes for some reason =D
Very neat game overall. Quite well made for your first platformer. Keep up the good work!