Hii,
I've played your game and I wanted to give a little bit of feedback:
The controls are pretty simple, which is both good and bad: for this type of game you could make the snake follow the mouse cursor, this would give the game a nit more of a smooth feeling.
The concept of the game itself is very simple and a bit boring now, but you can always try improving on this, for example: the humans could shoot lasers into space from time to time, which you have to avoid. You could also try adding some satellites that have to be avoided.
(Do note that I know a first game is a big thing, so good job on finishing your first one)
-Remi