i wasn't able to figure it out, but it is really nice and i love the ps1 graphics aesthetics, good job!
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The youtube devlog has the playthrough I made before releasing the game. You can check where to pick items and what to do. Also the design was meant for the player to use the light switches to gain a few time in between puzzles.
Well, I didn’t meant to make any further explanation but I also didn’t play tested with friends before releasing but I think the youtube video has it all “explained” if you’re willing to test the game again.