Anyone knows this game?

[megaman_exe]

Hi, I was looking for the name of a game which I've been looking for so long. It's space themed like galaga, it's vertical scrolling shooter, and the only thing I remember well is that there's a boss which is a giant sunflower

I think this game must be prior to 1990 (perhaps between 1985 and 1988) because it was between that years when i saw it

It has some resemblance with mission 660, but I haven't seen that kind of boss (the sunflower)

Thanks for any help!