Here is a sample code for a game that satisfies the given requirements:
SCORE: 0
LEVEL: 1
The game works as follows:
- A dot appears at a random position inside the game area every 2 seconds.
- A letter from the alphabet is displayed inside a box at the center of the game area.
- The player has to press the corresponding letter key on their keyboard to "kill" the dot and make it disappear.
- If the correct letter is pressed, the next letter of the alphabet is displayed and the game continues.
- If the wrong letter is pressed, the game is over and the player has to start over.
- If the whole alphabet is completed, the score is incremented by 1 and the next level starts with faster dot appearances.
- Every 5 points, the level is incremented and the dot appearance speed is decreased by 0.1 seconds.
- The game can be played indefinitely until the player loses.
- The game includes some simple styling and emojis to make it more enjoyable to play on a smartphone.