Space Invaders - Javascript clone

This is a Javascript clone of the classic arcade shot'em up by Taito. The code is based on Youtuber, Coding With Adam's video tutorial.

Improvements made on the tutorial's code:

• Player starting position centered

• Player bullets are removed when completely of the screen

• Enemy bullets are fired from the bottom, rather than the top, of the enemy

• Enemies trigger GameOver when reaching player base line, rather than collision

• Infinite play (game reset when Space down on GameOver screen)

• UI with score and Hi-Score tracking (10 points for every enemy death, score resets if lose)

• Lives tracking in UI (1UP every 1000 points, lose at 0 lives)

• Enemy shoot sound

• Enemy waves accelerate at each win, resets when lose, stays constant if enemies reach base.

• MotherShips spawn at random time and on random side; they fire at random times and are removed once they've crossed the screnn; they give random points, tenfold of grunts when hit

• Varying enemy points acording to color

• Added Pause and Escape

In developement

• UFO sound and death sound for motherShipController.js; classic moving sound for enemies
• ennemy wave acceleration as their number shortens ? gameplays in modern/classic modes
• upgrade.js and upgradeController.js for upgrades droped at MotherShips death

Try it here