I love that game. Ridiculously addictive.
Hmm, it would be interesting with some RM implemented features. Are you planning it as a minigame type release? If so it might be cool to have special tiles crop up - like two star tiles and if you match them you get an item drop or something.
It would probably be more like a mini-game engine.
It would be similar to how RM is offered: you can play it out of the box, or you can customize it as needed.
The game can be played stand-alone, or integrated into a larger project.
Plenty of customization options would be provided, with full integration with the event system to allow devs to choose what happens when tiles merge, for example.
Also, integration with the map system.
You can use the standard 4x4 grid, or you can customize and make your own grid.