Super sick art, and great sound. Wasn't able to finish sadly as I got stuck on the Coeus boss.
Going in, I was worried it would be difficult to find my bearings due to the retro style, but your map is very good, and there are plenty of landmarks around to find your way which is great. I do have a couple of nitpicks. I think the weapon sprite is a bit distracting since it doesn't move and the overheat meter doesn't fill by pixel. Also, my weapon kept overheating because I expected to have to stop once the meter got to the top and not the second to last layer. I think the larger projectiles from the Coeus and Shield boss are very difficult to avoid, and feel like they spawn right in front of you.
Overall though really great job, and had a lot of fun with this one :))