@subpixel:
Thank you! :)
I remember when that time I didn't add the detail when the game is in progress.
@clemonades:
Thank you! :)
With keyboard, the difficulty can be lowered ;).
@Wolod:
Thank you! :)
Also, thanks to the who created the music that I can make the game better ;).
@Gawain (DarkGriffin):
Thank you for your feedback! :)
About the main menu, someone else addressed it too. I guess I will probably make the play button bigger to make the GUI more intuitive in the future update :).