Few suggestions...
I think it's a very cool game, animation and drawings are perfect, couldn't be better.
Physics are also very predictable, which is good. Concept is very cool also.
In the sequel, I would add additional pencil colors, with different bonuses (e.g. yellow: regular speed, red: faster, blue: slower)... and expand the whole gameplay a bit. But don't make it any harder - it's good as it is. I had 30 000 points, and made him happy.
+ a hall of fame (room in the umbrella man house), where you could see your achievements.
Also, restarting the game takes to long...
But all in all - great job! Kept me playing 20 times or so...