Unoriginal, not well duplicated.
It shows you know how to code or, at least, rip code from others and make it work. I know it's supposed to be a remake, but it's not, really. It's more of a fan game for an arcade game. If it was a remake, it would have everything the original had and maybe a little extra.
Your animations are lacking. The explosions are boring, and the stage is even more boring. The grid doesn't have that really awesome distortion effect, and the stage doesn't scroll. The AI is dumb, more dumb than the original GW, often running right into my bullets. The music is ripped directly from GW and the original artist was not given credit.