Found a puzzle level - really liked the frogger-like bit but then got stuck at a bit where a platform was turning away from me and all i could do was fall off!
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I also took lots of tries to get over the last rotating block - but again it drove me to keep trying. Unfortunately when I got the key and returned to the dump the game crashed for me as well.
I liked the surprise of discovering a puzzle when I entered the pipe - I wasn't expecting the change and I enjoyed the puzzle level that I found.