Super Darius

Super Darius - Title Screen

And though the enemy patterns aren’t actually any different than the original, I would imagine the zoomed-in view makes for a lot of re-learning for those who had spent a lot of time with Darius in the arcade.

Darius

Darius (Arcade) Title Screen

According to Ogura he was only given one month to complete the music for the first Darius.

Gradius

Gradius (Arcade) - Title Screen

An even more novel idea than introducing real enemy patterns is distinctive Gradius power-up system.

Gradius

Gradius Famicom Title Screen

There are plenty of other changes that had to be made to accommodate for memory limitations of a cartridge in 1986 though.