I have an iPhone, an iPad and a Mac desktop, is there any good way to play this game on Mac? Wanna make sure I've got a plan before I buy.

Though I have no firsthand experience doing it, people have reported this technique makes the game playable on Mac computers.

https://forums.rpgmakerweb.com/index.php?threads/how-to-play-any-rpgmaker-on-mac...

Give it a shot, and if for whatever reason it doesn't work after you've bought the game, contact me for a refund.