- Player moves ship horizontally by pressing on keyboard ✔️
- Player shoot aliens, which can move horizontally & vertically ✔️
- When bullet reach alien, alien disappear & total score increase ✔️
- Aliens can shoot too. When alien hit player, his lives decrease ✔️
- Player can hide behind obstacles
- Game ends when player lives become 0 ✔️
- Game has record table ✔️
- Game has sounds effects ✔️
demo.mov
ruby lib/space_invaders.rb