Nice! Similar to my game. I discovered a bit late about the sprint function on the shift key.
Currently #1 in the rankings with a score of 125456 :)
Think I found a bug: pressing Play after dying seems to start you from the last stage you died on (I couldn't clear stage 8)
Tip for future dev: a feedback sound when hitting an enemy would be nice (I see below commenter also mentioned it)
Good job.