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Ohhh I see what you mean now. Those aren't actually the outlines of the sprites, but a weird glitchy behaviour unity has with tilesets. We changed the material of the tiles so that it had pixel snap on and we disabled antialiasing, and now it doesn't happen... some of the times. Don't really now why it happens, but we'll work on it once the jam is over. Thank you so much!
I mean, I know about tile tearing but it's not a big deal, the outlines of the sprites seem to be lost (look at the character or at the pause icon). I'm not a Unity user but there might be some setting to enable bilinear scaling (ironically, I have the opposite issue with OpenFL where I wanted nearest scaling to keep pixelation and it was fixed on some linear/cubic😅)