Really liked the graphics and music/sound and had a great gameboy feel. Also really like the check points so I don't have to start all over again if I die as it was fun to try the different levels.
I couldn't quite figure out the roll mechanic, particularly when hooked.
One issue I did hit that wasn't mentioned yet was that if you tabbed away to another browser and came back I couldn't get input working again. :( So I lost progress when I went to answer someone that sent me a question.
Also, for some reason the gamepad input didn't work for me. Maybe it doesn't work for this game in browser?
Overall I think this is a great game, good job!