Doesn't seem to run for me? Windows 10.

Neat idea, didn't get far enough to get a good grasp of the theme. That's probably my lack of creativity in figuring out what your take on it is. As far as the third piece, it's almost like the worse it is (sadness from fighting), the more I have. :wink:
(Also, on my particular machine, it seems to want to crash/hang about 50% of the time I run out of health/fall in a hole.)

Your biggest issue at this point is really a lack of polish. Your walking animation is well done and the movements feel smooth (the jump feels a bit floaty, but not frustratingly so). It feels like with a little more time you could have fit sound and music in to make a pretty well-polished piece. As-is, you've still got a pretty good game here, and I enjoyed playing it. Nice work!

Fun, simple gameplay. I kept getting the keys mixed up though. Since jumping is a key mechanic for this game, maybe spacebar would have been a better choice?

I didn't experience any of the issues reported by others.