It looks great. Are you going to add a map for the background? If you do, you should add a short cutscene in the background to give players a peek of the game before they play. Don’t forget the title of the game.
Looks good, like the style! My main feedback regards the shape of the “Play!” button. Squares aren’t very common, mainly because they don’t fit the size/length of the text. You did the “Join a Friend” really well - I suggest making the play button into a rectangle, to be more visually appealing.
I think that’s an issue with the font - for some fonts, the fonts are off-centered automatically.