For some reason I had problems showing it on reddit. The game logo itself was intended to be a reference to the movie logo, but if you look closely, it is not in an accurate enough font to be considered trademark infringement.
About characters designs, it would be problematic to some extent. The plot is the only thing that is completely different, as it doesn't follow the plot of either of both Wreck-It Ralph films. It isn't about a villain who wants to be the hero, but fails, or about a girl rejected from the race for being a glitch and who is secretly a princess.
It's an adventure story about two kids who are chosen to defeat a robotic supervillain called Cracksom Virus (a cliché plot, but it's a template for many other stories).
Being sued just for a logo and several characters would be like judging a book by its cover, since it also has to go deeper by seeing everything the game contains before declaring infringement.
There is a phrase from a lawyer whose name I don't remember, but he said the following: It can't has a monopoly on styles, because otherwise the industry would have been frozen for years (all as long as it doesn't look too obvious).
And if you think he doesn't have any wishlists on Steam just because it seems too inspired, as of the date of this comment it reached 125.