The grammar mistakes alone makes me suspicious.
Of course, there's also the random capitalization.
And in addition, Cyclone Studios already exists as a legit company that makes Steam and Switch. There's no way they're gonna make a Brawl Mod with Nintendo in their contacts.
And lastly, why on earth would he use a personal email instead of a company one if it's the studio reaching out? Plus, that email's mad suspicious. I bet if you hover over it, or copy-paste (without entering), it'll take you to a malicious website
Tl;DR, scam.