NES Found this cute defender style game, Bee 52.

[supershredder]

It is a fair bit challenging at first, and will try your patience. Just give it a few attempts, it has very responsive controls.

The Code Masters Archive - Bee 52

 

[Nelson2001 Nelson2001]

I played this game once and it's not bad, although it requires a lot of memorization in the following levels, both in the enemies and obstacles, yes, but I know how to play at least.

 

[DreamCPS]

I guess it took its name from the B-52's (the band).

 

[Ikagura Ikagura]

Can we see Fantasy Zone as a Defender-like?

 

[supershredder]

Can we see Fantasy Zone as a Defender-like?

Yes.

 

[Ikagura Ikagura]

Yes.

Bidirectional shooter may work.

Also speaking of NES games I am surprised the Famicom had Fantasy Zone