Love the concept of this game! Just played it for the first time (update 5 is live) and the controls feel pretty good to me. The currently difficulty seems pretty fair, and it's a fun challenge to go back and beat the game with 2x speed.
Awesome concept, would love to see a longer version, though more mechanics would have to be introduced to make it significantly longer. Lots of potential though if other "abilities" were introduced (being able to push things, being able to pass through certain objects, having the ability to change size, etc.) I also think it would be cool to have a puzzle where you were forced to be able to not jump but you could double jump. (Right now, when this is the case though, you can't actually double jump.)
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 "Encaged"){kind=icon}
 "I Wanna Be The Flash Game"){kind=icon}
 "AdVenture Capitalist"){kind=icon}