Really like the game, just my kind of jam. Is there a wave after endless wave or that's pretty much it? Beating the highscore is nice, I haven't played 2048 for days on end for the story but just a highscore to beat gets old fast. Unlocking new kinds of dice and stuff would be interesting. I figure you already have few ideas.
But like I said, really liked other aspects of the game, especially aesthetics and this kind of games play so I'll recommend it around.