The genre is Couch Party Games and some games to use for comparison are:
Hello, so I am trying to figure out the best way to approach the ui designs for this game I am working on and I am not quite sure the best way to go about it.
I’ve done extensive research but nothing feels quite right.
Main Menu Idea I came up with
Cartoony Movement
Any help would be greatly appreciated!
Personally, I’m a big fan of how you’ve approached the title screen with the 3D UI in sort of a ‘Bubble Font’ (if that’s what you’d call it).
If you were to want 2D UI’s, I’d stick with something in the range of the cartoon-based aesthetic that differs from what normal cartoon UI’s have inside of roblox, possibly taking the approach similar to the ones shown below, but possibly with a better colour palette that would match the game more. 
Another style that could be used is something similar to ‘Feed Your Pets!’ by ‘small games’, but with the corners slightly rounded so it doesn’t look as harsh
