I really liked this! Your displays of cruelty were creative. I liked both the brutality of getting vaporized by a flick and the disgustingness of nearly suffocating from a burp.

Emily giving in to temptation was a fun moment - you did a good job establishing them as reckless vs strait-laced, then subverting the expectation. The dialogue felt natural.

I would enjoy seeing them draw out their cruelty a bit more - how much abuse can one enemy soldier take?

If you want to expand this into a longer story, you could give them some normal-sized allies to interact with and be friends with, to heighten the contrast of them being ruthless to the enemy. Maybe a normal-sized radio operator gets sent out with them and reacts, either gleefully or fearfully, to their overwhelming power.

Looking forward to your next update!