A video game I've been playing has the following word in it:
I'm not familiar with
アェ. Does it represent a specific sound? If so, what sound?
If it makes sense to do so, please include
アォ in your answer.
“アェ” is not a valid spelling of any sound in the standard usage of kana letters. If it is used to describe any sound (in a nonstandard way), I agree with AHelps that it probably describes “æ” sound.
However, according to web search, アェウクス is a password which appears in a video game “時空の覇者 Sa・Ga3.” As it is a video game, the password used in it does not have to be actually pronounceable. It is スクウェア (the name of the company who made the game) spelled backward.
I usually would do this in a comment, but I lack the reputation to do so.
Click the "speaker" icon, usually Google gets those things quite right. Also I assume that you would rather spell the 'a' in 'fat' with a エ