One thing I love about this game is how everything is pixel art except the hazard itself, which is rounded. It makes it feel more foreign to the environment. Great way to tie art together with storytelling!
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I've never realized it but you're right, it does make it better!
It mostly comes from the fact that scaled up pixel art doesn't look too good, but I was never bothered by keeping it a circle anyway. Probably for the reason you mentioned, even if unconsciously.
In any case, thank you for playing the game!