As others have noted, messing with asdf is a bad idea. Makes it a constant aggravation.
And the important keys on the other side--- its a cop out. Clearly not a common-sense solution to make a one-handed keyboard and put a bunch of keys unreachable.
And the keys are too small. Different people have different reach-- make it customizable. At least have a few sizes to choose from.
All-in-all, this feels like something that everyone knew wasnt ready to release, but they decided to throw it out half-baked and fix it in updates. I hope.
Yoshiyahu262 about Handy - The One-Hand Keyboard for iPhone 6 and 6 Plus Quick & Easy 1 Handed Typing