the controls are annoying. maybe you should adjust the jump power/speed. made it trough the sewer but gave up quickly. you all really should reconsider the jumping mechanic. frog's sprite doesn't really fit in the setting of the game, and probably needs more than 2 states. particles are lazy.
but the music is very calm and nice. it may be a reason for me playing longer than 5 minutes. whoever chose it should get a reward.
the concept is nice, but practical part is unplayable. keep on developing!