Great colors and style, it does feel very Neon! I was little confused about the first boss battle, but I think I figured out what to do in the end, it was very forgiving. Interesting controls to get used to, left and right have so much momentum to them and up and down are like being shot out of a cannon! However, I think that's good, a new skill to learn.
Sometimes I was wondering if something would hurt or was part of the environment, not sure if that's intentional or not? The glowing boss was epic! Also of course, appreciate the use of godrays :) Foreground objects add good ambience. I hope you continue work on it. Congrats on the initial release!