Ok this is a really interesting idea. The co-op controller setup is something I've never seen before, so kudos for coming up with that.
The game feels quite original, though I had a tough time actually figuring out how best to play. I couldn't seem to get my umbrella opened (I tried R, F, but it didn't open up. it just partially opened then closed). I'll have to try to get someone else in my family to play with me to try out the dual controller setup.
Really neat idea and great execution.