I really like the concept! The web version was a little laggy for me which made the controls more frustrating :(. Also there was a bug for me in the level with the windowed box, the circle filled up to just barely done and stopped without completing the level :(
It looks really cool though, and I'd love to play more! I'm guessing the lag is more to do with the browser than your game, and would be fixed with a downloadable version (after the jam is over of course) :)