Nice take on a minesweeper game! And for 2 days, you did pretty good. For the compression with Unity issue, did you try setting the filter mode to Point and compression to none in your asset? That should help render your pixel images smoothly
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Well the Problem is, I generate these textures at runtime so there are no actual assests and I didn't find a way to disable compression for Texture2d in time (I think you could use a Rendertexture instead). A better solution i can think of is probably to just create a 2 dimensional array to store the colors and then copy them over.