Good concept...
...but needs more polish. Found it to be kinda buggy.
-Sometimes the old man's lines garble into each other
-There is a lag between the time you actually click the mouse and when the old man actually jumps.
-Sometimes the old man will simply fall out of the air in mid-jump, usually just before I can execute the double-jump. Maybe the obstacle boundaries need to be adjusted closer to the visual size of the obstacle?
-You can't skip the instructions when restarting stage 1. (I know, not really a bug but irritating regardless).
Some fine tuning and this game could really be fun.