Wow, this is pretty trippy. I do like the overall bizarre feeling of this one. From the cartoony graphics, to the growth and shrinking mechanic, to the unexpectedly bloody enemy deaths. The soundtrack amplifies that feeling too. It's kind of like Mario, but totally weird.
Theme-wise, I'm not hugely seeing the "Life is Short" beyond the title and open animation, but that's ok! Though I wasn't able to beat the game, so maybe it becomes clear at the end?
Anyway, keep up the good work!