We had an issue that failed to carry over the steam cloud data when switching the game name from Letter Lancers to Rogue Fist. I've corrected the issue I overlooked and did a hotfix that recovers that data. You just need to login to any computer that previously had Letter Lancers installed and it'll merge the data for you! Any upgrades you had will be unallocated and be given back as gems, so you'll have to reallocate those. All your levels and experience will be merged as well, nothing should be lost :)
Sorry for any inconvenience.
Cheers,
Steven.