Having N3, I'm dissatisfied with my experience. In the first place, calling the -masu form "present tense" is incorrect AND misleading. The typing is clunky, and since it only uses the westernised type of transcription, it caused me to make errors as I'm used to typing tu, ti and si rather than tsu, chi and shi. It's also unclear why you can't use your phone's keyboard, especially since the input of gboard is much more responsive than the ingame keyboard. It's good you can skip levels though.