IMO this is a good fit. There's no rule against it, and I'm a fan of not splitting up communities until really necessary. Maybe once there's so many people posting code for review that it becomes annoying to find other posts, then it'd be worth creating a new code review community or something.
Maybe when Lemmy gets bigger, I'd like to have a Python community for news and a learnpython community for code help like we had on reddit. However, this community isn't huge, so go ahead and post it here.
Theres technically a code review community at !code_review@programming.dev although ive seen some people also post code reviews in the language/engine communities