I played through the demo all the way until Day 3, but I got stuck trying to figure out what to do for the green one. I tried getting the item that's placed where the jump puzzle is thinking that was the KEY to solving my dilemma, but I can't seem to get myself back upwards because pressing the down key pushes the player onto the square just below that. I'm wondering if that's intentional or if I was doing something wrong. I could work out the rest of the puzzle just fine. That one part though I couldn't seem to solve. Maybe that's why Pinky took all day....
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I tested it out for myself again, and it is indeed a little sticky for whatever reason. You can definitely get back up after collecting the key though, you just have to face the direction the arrow is in front of you. But it IS trickier than it's supposed to be. You have to very gently tap down or it moves you too far away. -_-
This is about where you have to be when facing this direction to bounce back. If it doesn't work still, lemme' know and I'll try to find another solution for you!