1-5 yes. As has been said many times before, the first 90% of making a game is design, the 2nd 90% is optimization. If you're willing to put in the time, you can make a great game. It takes some time and a bit of brains. Also, learning the export process can be an undertaking, especially for mobile games. I've been at it for 2.5 years now and feel like I'm starting to get a bit of a grasp on the software. Luckily I've been making music and art since I was a kid so that's paid off. You'll want to identify any weak points you have and outsource those tasks or use pubic domain assets. RPG elements can be incorporated. You can honestly make it as complex as you'd like but you'll have to apply yourself for a long time to do so. Anyway, good luck!