#12 No Clear Stage Transition or Retry Options

[Angel]

I noticed that when the player completes a stage, there is not a window informing him with a message (e.g. "Stage cleared") and guiding him to the next stage (e.g. with a "Next stage" button).

Something similar applies in case the player loses.
Again, there is still no window with a message (e.g. "Game over") imforming him about the situation of the game. Similarly, along with the relevant message, a corresponding "Try again" button could be displayed.