the graphics may have a slight upgrade but not very much, looked good as it was anyway. the main difference is the controls, it's point and click to do all the shooting and to change weapon/visor, you hold -/+ respectively and it will bring up your weapons/visors, you just point to which one you want to use and release the -/+ button. there's also more stuff to unlock, like soundtracks, artwork and other things. you can also get a camera mode that allows you to take screenshots.
i have to issues with the game
1. as you go through the game you get different types of credits for various achievements which you use to unlock thing but the best things can only be unlocked with Friendship Credits. you collect them as you go along but you have to send them to someone else so they can use them, so in order for me to unlock the good stuff, someone has to send me the credits they have collected but as i don't know anyone that has the game, i can't unlock a lot of stuff.
2. as the 3 games are on 1 dual layer disk, it can take a long time for the game to load between rooms, which can be really frustrating when there's a time limit or you're blasted by some git and are low on health.
still, the games are SO much fun and i will certainly be playing them again