Nice oldschool arcade experience,
it's quite rare to see a return to the classic galaxian/galaga formula, but it's nice to see and you did it well. I like the spritework, ships have some cool design and these explosion animations are super satisfying, you chose a nice fitting music with the space theme, just too bad there are no soundeffects to give the action a bit more punch.
I have 2 small issues, the enemies don't seem to do much once they get "in formation" maybe having some shoot or making them move progressively downwards à la space invaders could spice things up a bit, and also both the player and some enemies seem to be able to go a bit outside the screen (beyond the black side borders)
Other than that it's fun and chill and i enjoyed it.
Well done :)