Driven to the edge of sanity, resigned to his fate, HUMPTIE de UMPTIE tries to commit suicide; when THE LITTLE LAMB arrives, hindering his every attempt to succeed.

I don't get a sense of how this story will sustain a feature-length film. It will suffer from being multiple versions of the same scene, Humptie attempting suicide and the Lamb stopping him.

Although it's facetious, that's actually a 9/10 logline.
Has stakes (lamb steaks), a protagonist, an antagonist, a "ticking clock", genre, and bonus point for dramatic irony (a suicidal hero who's nemesis wishes to save him), like Sherlock and Moriarty.
You're missing genre though, is this film noir, a pastiche, a satire, or indeed a children's film?