The game looks alright visually but you shouldn't be focusing on that right now in my opinion, the design of the starship being a star quite neat but when you are shooting you don't quite know the exact trajectory the bullets so I suggest to have like some lines that shows that and you need to make the player rotate based on something like the position of the mouse cursor because you are limited in terms of aiming.
There are other things like polishing the controls and making different enemies, but I think you should concentrate on the things I said earlier.
For a starting point this game is really good, keep on improving your skills!