Getting there....
Not too bad, for a short. I guess the only comment I have is about some of the animation. What made a lot of the moments in Ren & Stimpy stand out is minimal animation with short, quick bursts of large, dramatic movement. If Rihm were to have taken small, drowsy steps to his chair and then jumped into it all wacky-like, it may seem funnier than bouncing the whole way, because there's a change in energy level involved.
I like the way the punch was animated, but it may have gone on a wee bit long. Huge pauses like that are usually followed by unexpected actions... for instance the fly that came out of the box getting in the way of Rihm's fist and breaking his hand or something. I was expecting him to get hit in the face, and that's what I got, so I didn't think it was funny. The small ricochet off the moon, however, was very unexpected and made me laugh out loud, as did the eyeballs at the end. You certainly have talent, just keep up the good work and maybe study John K's animation a little more closely if you want to make a really outstanding tribute. :-)