Got nothing out of it.
aspects (rated from ----- to +++++)
=====================================
+: it was short
++: fast
--: wasn't funny
meh: crappy animation. Enh. Intentionally crappy. Yeah yeah.
-: Why would grandfather burn the building?
+: Birthdays bring joy
overall
=========
Enh. Not sure what kind of response you're expecting or hoping for from folk, or if you even intended for it to be seen by 'outsiders'.
I got nothing from it. Just a vague impression of a fast semi-nonsensical story. Didn't really entertain me.