I love every bit of this. The sound effects are put to great use, the characters are wonderfully drawn in such a fun way, the voice acting all sounds good. I especially like the punchline here, it's a great "dad joke" kind of thing. Really fun stuff, I think the only thing I felt it was lacking was some more background work. Even if it's little stuff, you can even keep it in black and white, but for example, when the character pops out of the hole in the ground, that's all there is on screen. The hole, and the character. You could have drawn some little rocks or anything really to just further demonstrate, and elaborate on the setting a little. Otherwise, this is great work.

Rounded to 5 for judgement :)