Kairobotica is part simulation and part RPG, but it's not really thoroughly in either camp. Well, it's more solidly an RPG than a simulation. Anyway, it has elements of both genres, but if you're looking for a game that is an RPG or a simulation, then this might not be what you're looking for. But it is awesome nonetheless.
In Kairobotica, you run a space ship that is home to a bunch of red and yellow robots who go down to the planet surface the ship is visiting and beat up bad guys, who usually take the form of food items. Those rice balls sure are tough!
It's a simulation in that you have to manage the economy of your ship's community. You can't grow the ship and produce more robots if you don't have money, and you make money by going on missions and getting tourists to come visit you.
It's an RPG in that you take your robots down to a planet and have them fight turn-based battles against the living food. If you win, then your stats improve. The fighting seems overly simple at first, as you only have an attack command, but as you progress you learn abilities and gain allies who can help in battle, and it becomes more complex.
The game is pretty simple altogether, but this is a grind that is mostly pleasing because it's not a terribly slow grind. The goals – making your ship bigger so you can build more robots, getting planets to like you, etc. – don't ever feel out of reach, and you don't have to play obsessively to feel like you accomplished something.