I'm still failing to see where 800MB are coming into play.
Scripts are text files, tiny, kilobytes each.
Images...dear god I have a 391 file wallpaper folder full of .jpeg and .png and it's only 320MB, how the hell many resources do you have in your game? Is it full of mp3's that you intend to use? That's still a LOT of mp3 files...
And if you have 800MB of resources in your game, you're probably A) not using it all, B) NEVER going to use it all and C) will have the most disjointed and unrelated art/music styles ever, making your game look like a total trash heap.
There is no good reason for a 2d RPG Maker game to almost take up 1GB of hard drive space. If it was a top-notch 3d 20 hour game made with Unreal then sure, maybe, but an RPG Maker game? Damn dude that's just crazy.
Just throwing every song/picture/script into a game that happens to look cool isn't going to make the end product good at all.