Looks nice. Reminds me of MessagEase[1] and clones, such as ThumbKey[2]. I use the latter for my mobile text input needs. However, that method is sometimes prone to typos, since one key may have up to 9 different characters assigned to it, and it is easy to swipe slightly wrong way. QWERTYmini could be better in that aspect, since there are only 2 characters per key.

1. https://en.wikipedia.org/wiki/MessagEase

2. https://github.com/dessalines/thumb-key