Make default character size larger
Shield and score values are shown in status bar.
Make the block smaller
Modify block generator. (x coordinate calculation)
Adjusted size of block. The blocks would fall now.
Fix an error in MainWindow::startGame modified in last commit.
Fix: falling speed calculation
Optimize: added fallingDelta in MainWindow::timerEvent
Falling speed of the block would be adjusted when the window is resized while playing.
Added checking in timerEvent. If the game is ended, the event handler would quit immediately.
Fix: a memory leak.
Fix: score will be shown correctly.