I love your games.
I love the general atmosphere of your games, always very calming yet disturbing. This one was a little frustrating because I often got lost at what to do, but nonetheless it was an interesting play. Also a little sad when I found the last hidden item and who is was for because I realized how Coma really ended. The ending for this one is very ambiguous, but maybe you would complete it somehow in your next game, a little like Coma? I can't say for sure.
FOR THOSE STUCK ON THE LAST GEM BEHIND THE DOOR WHERE FELIX IS STANDING:
Actually I was stuck for a long time too, but basically you have to press the blue gem on the platform in the middle of the map that also opened the door that led to the underground tunnel. In order to get there on time, stand on the moving gondola thing and press the blue button with your hook, then quickly jump up to the top platform with the spring and bounce yourself to the other side, this way it will save time compared to actually standing on the gondola and waiting for it to reach its destination. Once you are on the right side, quickly press the yellow button and drop down and walk to Felix.