What you could do is release the "Hacked" version of the game yourself and distribute it. Except, put in little features to make life more difficult for those who play the "Hacked" version.
If your game is already "cracked/hacked", then who will bother trying to Hack/Crack it? Even more, if they hack/crack it as well, to avoid your "terrible" hacked version, it makes it difficult for people trying to get the actually Hacked version to tell them apart. Especially if you simply rename the files every month or so to the same things the Hackers use.
There are a few Indie game studios that have resorted to this tactic, to pretty hilarious effect. With "customers" revealing to the devs, unwittingly, that they have a Pirated version of their game.
What might be the easiest option is simply to get your game onto Steam. Most people regard steam as the "official" version of the game. Which, makes it harder for someone to copy the game and redistribute it elsewhere for money. It doesn't stop people distributing it for free, but makes it easier on you to prove that the game is actually yours, when you're getting an official distribution through a platform like Steam.
As for a full protection from Hackers? Yeah, I don't think that's possible. If someone wants to hack your game, steal your assets, steal your code... they're going to do it. Most of the people who do this sort of thing don't even see it as "morally reprehensible", so you wouldn't even be able to shame them out of doing so. The best you can do is make the end result "not really worth it". You don't need super high end protections, especially with something like RPG Maker, but if the game itself simply isn't worth stealing... because you make it JUST ANNOYING ENOUGH... That usually does the trick. Because, who wants to have a free RPG Maker Game when they can get a free AAA title instead? The art assets though... There's always a high demand for music and artwork, so that's almost always worth stealing. Always best to watermark those in some way if you can.
