That was cute. I like the style. I was a bit confused though, because what are searchlights and buzzsaws doing in the middle of the city? Why was the squirrel even there? I guess he was looking for the oak, but can't he just fly over everything? We also weren't given an indication he was actually searching. I liked the premise though. I found it funny how easy it was to "defeat" the Oak. However, the sound effects and/or music seemed too quiet. The whole thing, as a result, felt kinda understated, which, seeing as how you had bouncing sound effect all over the place, was kinda weird. Maybe you could have had the music swell dramatically as he was winding up to punch the oak and then had it be a little tiny squirrel punch. I think that would have worked well. That ending screen was funny though.
Overall you've got some nice things here. It's a wholesome one-off joke, but it just felt kinda underwhelming. You have potential though, keep it up!