I feel stupid, but I can't seem to enter the desert. It says talk to Marcellin, which I do. I say I am ready. He then says lets wrap up things. And then nothing. Sometimes I restart the game and he is missing. I am not sure how to proceed!

OK, i'm stumped. I've lit the pillar in the first room by moving all the pillars with lenses on top, but now stuck on what to do next. It seems like I need to do the room with two glowing orange squares, but I'm going round in circles on what I'm meant to be be doing?...

I got stuck on the second level on the desert, the one that introduces the firewall. I got it so that i can ice a cube on the other side to take down part of it and let the yellow beam through, and then use a redirecting block to make the immovable redirecting block float, but i'm stuck after that. I think i need to get rid of some blocks in front of the purple laser b/c that's the color you need, but idk how to do that. I did figure out that you can move any block if you just face them with your back, and...

Any suggestions on the rock achievement? I think I interacted with all the rocks I found, finished the game, and then started over to get to the top of the tree since I missed it the first time; I started the rock without climbing it. But I didn't find anything on top, thinking it was the one for the achievement (or do I have to search better?). As for the rest, I don't know where to look. D:...

Please add the option to invert the Y axis for moving the camera. As someone who is used to it, I cannot enjoy the game; playing is too frustrating.