Thank you for trying out the game! I was thinking about black sky, white floor back then but the enemy sprites would be in a weird spot where they can't be whole black nor white as they will merge into those color so this fog is what I came up with. 1-Bit style are harder than I expect but very fun nonetheless!
As for the enemies, I couldn't manage my time well enough to make them have more I N T E R E S T I N G behavior due to exams week TwT
I will focus more on sound & visual reaction in the future game
Btw your game is very cool