I have a game made in Rpg Maker that, aside from it's music, uses all Rpg Maker resources.  (Being that I own a copy of Rpg Maker vx ace)

If I were to change the music to royalty-free, etc. would it be copyright infringement if I uploaded the game and made it free, but optional donations? 

Also,  is it even considered a commercial game that way, or is it still considered a free game?

I thought the point of the included resources was for you to use them to build a game, but I don't know the licensing enforced by RPG Maker.

It is , I'm just the overly cautious type, with how some companies are you can never know. 

You find this text in   www.rpgmakerweb.com/support/products/faqs

Add a "credits" page at the end of your game and credit all the assets you have used. Check what license assets have (usually there is a "read me" with them if you bought them or downloaded them for free). Assets bought on RPG Maker business site can only be used with RPG Maker, but you can also use external assets in RPG Maker.  Don't use assets if you don't know the licence.

Hope this helped. Happy game making!