It was alright but not great.
Most of it was just yoshi running into stuff then blood (or a red blob) appearing or yoshi would explode. And when yoshi wasn't being killed it was just random. (What was the whole smiley face thing with the coins about?)
Sorry but I just couldn't find those things funny. I've seen the same type of humor in a lot of other flashes so that could be why.
I think the main problem with this flash is the menu. Having to press play inbetween each scene really slows down the action and I think something like this flash needs to happen really quick like level 11. Like BAM! *yoshi dead* BOOM! *yoshi dead* SPLAT! *yoshi dead*
The other problem is the amount of unnecessary buttons and the switch between credits and movie. (I got stuck there until I went back to read your comments which I admit I should've done in the first place). If you just put the credits in line after the last sketch it would be so much simpler.
Animation and sound/music were acceptable. Nothing WOW but enough to get the jokes across.
All in all some people new to sprites might like it but it was just alright and not great.