Thanks for your feedback. I am glad, that you pointed out what was missing for you. You probably missed the the part which explains, that you need to press "k" key to rewind to the other world in which you could find the lever, that clears the way to doors. After death, you can always restart the game by pressing "Restart" button in the left top corner. Anyway, thanks a lot for your comment. In next projects I will try to make the goal clearer!
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Ah, I see! Ii just says that [K] does “rewind”, though, and I thought it was just time rewind as in most games in this jam. Tried it now - it is much better than I thought, a very nice mechanic indeed! Concerning the buttons: I found them, but they lack any text. I’m playing on Linux via the Wine emulator, though, so it might be Wine’s problem.