I think the proper term is Super Deformed? I dunno, most Westerners just use the term "Chibi".
In any case, it's just an art style and honestly? If you want to use it- use it! Style can affect who reads your comic but is mostly inconsequential. There are a few styles, especially the more grotesque styles, that only have a fairly small audience, but I'm fairly certain super deformed isn't one of them.