I enjoyed it, as a proof of concept! It plays well, though it's super basic at present, but that's what proof of concepts are all about. I'd personally like to see where you'd take it from here.
Thanks but what shall I add to improve the game? I can add more background art and improve the sprite art sure but I am afraid to add more complex enemy bullet patterns I might make the game too hard.
I shall try adding more weapons and experimenting but I am open to suggestions