Triax: The Rising

Triax, a star light-years away from Earth, is one of many solar systems in the universe that houses life. Triax has three planets - Laidan, the closest and most populous. Argos, the second and rockiest.. and Frigis, the third and coldest of the planets. Only Laidan currently supports life. In the Triax system, one thing exists due to the star's properties that doesn't exist in our own solar system: magic. With the magic comes good and evil intentions, and some of these intentions can cause catastrophic events, such as the dimensional void caused by an ill-fated sorcerer in one of the Laidan towns...

Triax is the first full game I ever made with RPG Maker (way back in 2002), and even arguably my best to this date. Below are some of the features of the game:

- Collectible gemstones, which are also used as an item to increase character stats. Collect enough of them and you get rewards from the people inside the gemstone house in Capturnia.

- Lots of custom shops in the world's "capital," including weapon customizing and alchemy used to make special equipment or items.

- Plenty of optional off-shoots to find ultimate equipment & gemstones. This includes the typical searching/exploring, winning certain mini-games or visiting certain areas, and even a trading market.

- Almost every town has a playable mini-game.

I'm not sure exactly how long the game is in terms of hours but on the RM2K engine you'll likely have your players no lower than level 40 by game's end, and more likely they'll be well into the 40s.