Really fun game! I enjoyed it! I like the exploration, the keys, the variety of enemies and obstacles that you have combined to create interesting encounters. I don't like the use of a run key though, as I basically just held it down for the entire time. I was going to say the same about the duck-jump as I found myself always using it, but then there was a jump-pad-into-spikes combo that meant I needed to consider my jump height...
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True, but in which case you could make is a walk button instead? Or a run/walk toggle? In a recent game I made (Dave the Space Pirate) I do exactly that - Dave starts off running but there is a run/walk toggle so that the player can choose a slower speed for more delicate platforming elements... It worked quite well :)