I've played with the shader further in a new project, the issue is that the shader is a post processing so materials have their own material/shader and then the cellshaderis on top of everything which can make it weird and hard to make perfect and with the time we had for the jam I couldn't perfect exactly how i wanted. But in a new project where i made everything of my own and taking this shader into account i've managed to improve it a lot and find a clear artstyle that is alike this one but more beautiful and easier to see in the dark
Sorry for yapping lol, thank you so much for playing and the comment with your opinion! I will keep trying