Thanks for playing and thanks for the feedback!
The middle platform in 3 puzzle is something that a lot of players have commented about. Again we see that it is not enough that the developer tests their own game. One should always have outsiders to the test the game as early as possible to prevent these kind of unnecessarily difficult section.
About the last level: that is actually the current ending for the game. The character dies in the pit and the screen goes black. I can really see how that might look like the game crashing though. It was not necessarily the best design choice I have made... I probably should have just kept the game more abstract and not try to include narrative when I clearly did not have time to do it well enough.