Nice idea and original retro-design! I'm not a platformer-fan, but this had a puzzle element that I liked. I also liked that I didn't die all the time like in other platformers... Music was also nice.
Some suggestions:
- Keys should be explained somewhere (I had to try them all out)
- There should be a key or even better a button to restart a level.
- The "shock-wave" is quite fiddly. I couldn't get the block flying very consistently.
- Maybe the retro look that mimics an old screen is a bit overdone. At least the screen-stretching could be reduced a bit.