Hey whenever I'm stuck on how things should look, I just look up references. For your game I did some search on good looking space games and found games like Last Horizon, Moon 2, and Grid Space Shooter. You can study the games' UI layout, icon design, animations, and colour pallete etc.
If I were to give some critique, I'd say you have too many colours. I know colours are important for your game but you still have to limit the #. Go to a website like https://coolors.co/ and explore the colour palletes they have. Pick one that suits your game's mood and style and stick with them. don't use any other colours in the entire game.
Otherwise your game looks really satisfying to play with awesome animations and sounds!