I enjoyed it.
My play
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Played it a while ago to finish. Got a near-perfect score on bonus level (missed 3 PCs). This is the 3rd time I play it. It's not as interesting this time.
Aspects (rated from ----- to +++++)
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++: training levels are good
-/2: if we wish, we can 'jump' over obstacles by moving the mouse quickly
---: No explanation re: rocks given. We should be given a hint there, I feel.
+++: I like the way you have moving obstacles drawn as spiders, worms and such.
-: Lava L2 - having to 'wait'...
++: lava L3.
++++: changing 'skins' makes the game more interesting
+++++: a good number of ideas and some variation
-: dying if you press a button
overall
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Quality game. Inventive levels. Changing graphics spice things up.