Oh, one more note: The Linux version is just the Godot binary, and is missing the .pck file that has the actual game data. I was able to play by combining the .pck from the Windows zip with the Linux binary.
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Thanks a lot ! For now we dont intend to keep going on this concept (we actually didnt talk about this) but we do want to make our first idea 100% playable (which means procedural dungeon generation, power ups and, well... being able to die would be nice too). We will export the Linux version again tho, thanks for warning us !