good first game!
Stuff I reccomend:
-Make sure the space ship doesn't spawn right next to/ on top of the player, I died because of this. I see you're using Godot, in which case it's pretty easy, just use "distance_to()" with the vector that you're randomizing.
-Have some sort of difficulty curve, make the ships spawn at a faster rate or something or the other to motivate the player to keep playing.
-My death screen didn't show up on the first time I died, this could be just on my end though.
-Personally, I think making the map loop around would be more fun than a bounding box, such as in asteroids :)