Renegade Kid co-founder Jools Watsham revealed the news on Twitter earlier this week. Watsham added in a follow-up tweet that 3DS has undoubtedly been the most popular platform for Mutant Mudds Deluxe, which was unlocked as a free content download on 3DS in the original Mutant Mudds game.
The varying length of availability on each platform is worth noting when comparing sales. Mutant Mudds Deluxe arrived first on 3DS in early 2012, followed by ports to PC and iOS later in the year. A Steam version was made available last November, then the PS3 and PS Vita versions launched in December. Watsham didn't say where iOS fits into all of this.
Renegade Kid is currently working on a few different games for 3DS, including atmospheric first-person shooter Moon Chronicles, loot-focused platformer Treasurenauts and horror FPS Cult County. Renegade Kid has also promised a sequel to Mutant Mudds, but development is currently on hold until work on Treasurenauts has been completed.