I've been busy trying to figure out the cause behind various issues with unlocks/purchases being reset and I think I might have fixed it, despite not being able to recreate it myself. I've also fixed various achievements and challenges that were not unlocking or being tracked properly.
Chording should also work properly now. I play tested this update quite extensively and unlocked all achievements manually to test them.
I have ideas for small updates in the future but I want to get the game smooth and bug free before that.