I started learning the barest basics of Kazkah (It was for a girl, long story) but I've lost most of it and never gone back. I think that has to be next on my list, it's actually a really beautiful language.
Thank you so much for posting this. I've been through resources and apps and found a lot of false starts. My school's registrar is Irish, and speaks Gaelic fluently, and none of the apps I found passed her test as "actually what Irish people say". This is a big help.