Thank you! Yes, I know which one. There is some leeway so you can jump a short time after touching the ground, but that shouldn't be necessary.
I will probably optimize the maps after the jam is over.
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Yup, I actually noticed that when I finally beat the room, very appreciated! I think a reason it took me so long is that a lot of jam platformers are very tight in that regard, so I liked to see that you put some care into making this more lenient. It's also just a minor nitpick, apart from that one spot, I found the levels to feel pretty good and fair. Post-jam update sounds nice, though :)