It was pretty good, but one question
Why is it called Goku vs. Mario, I understand that it was Goku, fighting some slug creature thing in a Mario world or something. Yet, I don't understand why you decided to put Mario in the tittle. Would have made much more sense had he actually been fighting Mario, but nonetheless a great job. Considering that it took you less than an entire day. Also it would have been better had the fight been longer, and more exciting. The creature thing didn't seem to fight back much at all. Also you lacked an ending, and I watch for 3 minutes then realizing that it had ended, which kind of made me feel stupid, bu thats my fault. The flash was alot better than the average crappy sprites that are constantly being uploaded unto(into?) newgrounds, so....good job?