Spent ages trying to find a name!!
As far as fave shooters go & what systems ,it's difficult to remember them all, besides, should you strictly list blaster's like say R-type,(Arcade version), but I can likewise equally say I enjoyed Turrican on the C64 which is a shooter/platformer hybrid??
Also enjoyed Operation Wolf on the C64, which whilst not totally perfect was very playable & a good version given it was a single load.
For all-out horizontal shooters on the Amiga, I think both Silkworm & X-out were underatted a tad both being quite playable.