Really good entry, quite well made! The atmosphere, and the attention to detail as well... just wow. The backgroud and the tiles, everything is quite well made, I think you got my point hahaha also, I really liked how you used the AudioStreamPlayer2D correctly. It is veeeeeeeeeery common for people to not use it properly, and in the end sound only comes from one side of my headset! The way you used it added a lot to the game feel.
I would suggest adding some music, maybe? Without music it already is quite tense and immersive, some music might break that. But some lighting, with normal maps and occluders would be a great addition I think. Really great entry, in my opinion it even has potential to be a full release, with a story, more stages, and some more polish here and there. Great work!