..just another space invaders clone...why?

Well, because as a teenager I always wanted to write a space invaders game but lacked the knowhow.
Now at 56, I have finally achieved it :)

I tried to capture the essence of the game, with original sprites and similar movement.
Soundwise, I did my best to emulate the original sound effects as best I could.
Particulary hard to emulate was the invader killed sound.

It's not perfect, I have seen the invaders split sometimes and start moving in opposite directions...if this happens...bad luck!

However, I am still proud of how it turned out.

This looks good. Seems you forgot to upload the cartridge and/or include it in your post, though.