The following is my own opinion. Take as much as you like from my review.

Grammar:
I am in no way trying to be nit-picky. So, I apologise if I come off that way.

"Come Detective, we should retreat to the main hovel and inform Mayor Bunny of our lack of results."
^ There should be a comma after come.

"Of a sudden a gargantuan green shape loomed over them."
^ There should be a comma after sudden. Also, I wasn't sure if you meant "all of a sudden" or "of a sudden". If you meant "of a sudden" ignore this.

Notes & Suggestions:

- I would make no suggestions toward the plot due to the few words you can have. If however, you wanted to make this into a full story then you should consider more background on each of the characters.

I found you story a fun and short read. It was well plotted and executed. Your characters were well fleshed out and layered. I could understand the situation from the start, and even though you had such limited amount of words you excelled. Keep up on the writing. I have participated in the Daily Flash Fiction as well and know how challenging it can be. However, it is great practice, and you get a prompt each day. Keep up the great writing!

My review has been submitted for consideration in "Good Deeds Get CASH!" .