Yeah you got this!
As for the art style, I feel like you can get help close to free, Your game already has some attention to do so.
But if you wanted to do it yourself, I can recommend building a reference catalog(Just a bunch of similar Style pictures).
Even for the style you going for, is flat color materials, and you can achieve okay results even if you don’t know what you doing. The main thing is to find a balance between color and shapes. And balance shapes with negative spaces(But for 3d models).Trying my hardest to not sound technical. You got it right in the title screen, so you know what you’re doing.
Ok,My best wishes, bayy