Hello :)
Fun game and a pretty cool art style! As others mentioned controls are a bit stiff, I would suggest adding acceleration to make it feel more natural.
I also found out that shooting mid-air gives you a slight boost in the other direction. Don't know if it was intentional but I had a lot of fun trying to fly over the map by constantly shooting, so consider adding it as a complete mechanic, I think it would make platforming stand-out and feel really fun.
Overall well-made, would love to see a full version sometime!