Thanks for playing the game! You're actually supposed to use the grappling hook instead of the disc in the lab, probably should have made that more clear. Also you're not the only one who didn't get it so don't worry.
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Aaah, I see! I'd give it one more go if I could save and return... but still, I had a great time playing.
I made a list with my favourite games from the jam and I couldn't not mention World Break, it was seriously love at first sight. Let me know if you'd like me to remove it or change the images!
https://yukisia.substack.com/p/8-tiny-free-games-i-need-more-of