support mouse and keyboard.
Keyboard control:
1(keyboard): hint - show 1 correct letter
2: arrows - show 3 incorrect letters
3: skip - skip current level, active after at least 1 guess
4,5,6,7: change to 4,5,6,7 letters mode.
8: open setting panel
9: dark/ light mode.
enter: submit word
backspace: backspace a letter