Since Cou mentioned the original Keytastrophe, I'll go ahead and mention
Keytastrophe Rebirth, which is SNN's more recent (and actually completed) take on his old hack. It's not too complex and is quite fun.
Lazy is my definitely my favorite puzzle creator, but unfortunately most of his works are scattered around large collaboration projects which aren't particularly puzzle-themed (namely JUMP½, YUMP and YUMP 2).
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