Excellent mini-metroidvania and a masterclass in sound design!! I think you could have gone even further with the creepiness of the evil air...like maybe a zone that turns more and more red instead of white... and you have to keep going. The it felt SOOO ominous and scary whenever I got close to running out of air. I had a few really close calls. The writing was good and the game has a really satisfying conclusion, which felt rewarding cus some of the precision jumps and the boss fights were tricky. Controls felt good for the most part. Only thing that felt a bit awkward for me was using the Sun Gun, i prefer left hand WASD, right hand spacebar, so I couldn't have my hand also on the mouse while platforming. The color palette swaps were effective as well! Great work!