I'm a beginner, and I think the signing speed is fine, but majority rule says you should probably slow it down a bit. Maybe somehow have an option to do it in slow mo? I don't know if that's even possible.
I don't normally correct deaf/hoh people unless they ask, but since you did:
On the directions page, you've got "appear" as "appiear" and "onto" as "unto." ... “breaking” as “braking,” “practice” as “practus” “cristmas” as “Christmas”,” also there’s “signd” under MODEL/SIGNERS instead of "signed". On TESTERS/PROOFES there’s “englash” instead of “English” “translactions” instead of “translations,” and “acaracy” instead of “accuracy.”
I misunderstood. You mean, 4 signs, and then flashcards to see which you remember? Definitely just 4 then, maybe 5. 8 would be way too confusing, I think, if I'm understanding this correctly. I think the English translation for when you get the letter wrong should stay just a little bit longer, because it’s sort of hard to see it sometimes in the little window. Either making it longer, or making it flash across the whole screen would be better IMO.
HTH!