There's three things I honestly don't recommend doing in games like these. Don't use copyrighted music, pirated fonts, and stay as far away from anything Nintendo-related as you can. The people in any industry most likely to shut down your project and perhaps sue are artists and especially people who create fonts. The latter actively search out people using their fonts (despite a lot looking just like hundreds of others), and I'm sure people who care enough to protect their music do the same. And even if the said artist doesn't care that you're using the music, they may not like what it's being used for (e.g. religion, etc.).
It's easier just to stick to the copyright-free stuff on YT, depending on what you're looking for. That, or buying some.