That is... really weird. I'm baffled as to how that happened, because I've tested the game plenty of times and other people have gotten into the levels. Yes, the menu is arrow keys and space, I didn't think I had time to add mouse input which is the reason I didn't. Very concerning if the "Windy Rocks" button is not working for just some of the players. I don't know where to start, but I have to investigate. Did you try the downloadable version? I also think it's worth trying to go into the level really fast as a testing exercise, just in case there's an errant timer or something.
Thank you for your glowing review of... the menu details. Hehe. It's really positive but that does tickle me. I wasn't expecting the text in the background to mean a lot to any of the players.