time aliens, new menus and more...

- Added a new enemy: time enemy, when you shoot it you get 25 extra seconds, it appears randomly in the map so try to find it when you're low on time.

- Added new menus: the menus are fancier and look better but they are for some reasons not working on itch, i'll fix it asap.

- New model for the heart of life: no more placeholder now it looks like an alien heart with void in the middle, shoot it for extra health.

- The game loop is complete so you can actually win and try to beat your own highscore.