Note:malfunction since EC 2.18
Yep that's it but don't expect a really big and well made one.
Use the buttons under the led matrix to move the red led (spaceship) and shoot blue lasers (blue leds) when a laser hit an alien (purple leds) it will disappear. To reset it flip the logic source on the right of the leds and then flip it again.
I used all the space i can trying to minimize the gates used and this is the result (two weeks of work,i have lot of freetime lol)
If you have questions ask in the comments.
Hope you like this ☺