I've been making some good progress in 'The Lair of the Clockwork God'.  The humour is pretty good, as is the gameplay.  Different constructs (levels) are based on different human emotions, ranging from joy, to fear, disappointment to 'feeling old'    The puzzle bits aren't too bewildering.  I think I've looked something up twice.  One time it was something I'd never have thought of, the second time it seemed very obvious in hindsight.