Potential Good Game Ruined by Horrible UX design

The games UI designer needs to be fired and go back to design school. This is a freaking mobile game and why you designed the UI buttons so small? Completely unplayable on my iPhone 6S Plus even when I switched to iPad its still difficult to read or press anything on screen. Its not like you r running out of screen space! You got massive negative space to play with on screen! Also so many other UI design flaws rendered the game so difficult to play - for example when u need to upgrade a unit, why do u force people to drag and drop the card onto the screen? Why cant it be simple taps? Please learn from other good UI designs like Ironhides Kingdom Rush franchise. Its not a first-gen mobile game and I cant believe people are still making newbie mistakes like this. I want my money back.

Superlip about Tiny Guardians