yeahhhhhh thats kinda cuz its stolen without permission
Yeah not to downplay anyone's opinion but I kinda have a moral obligation to highly recommend against playing Fullmoon cuz, well aside from the blatant stolen sprites and tilesets from multiple other fangames (all without permission I'm assuming), the plot is.... well ignoring the subjective details it supports a few unhealthy tropes to say the least.
Overall I would agree with the others above with trying out Pokemon Empire, it has many interesting gameplay mechanics and rebalancing of mon and moves to try out, complete with custom terrains, weathers, and field effects. Its still a work in progress (which I'm assuming you'd be used to with these games) but still a great game to play.