Yep, you take a stand alone game, decide ohhh few changes and that'll save us having to do a game from scratch for a Movie Tie-In so it gets reworked to suit that need, film tanks at box office so ends up getting reworked again and put out on the cheap.
Reviews are a personal thing, but when i was assisting Greyfox with Atari gamer magazine, i had my head in my hands when a contributor had awarded Star Raiders II 10/10...it just smacked of fanboy and i was concerned scores like this weren't doing us any favours.
The game soon becomes very boring as there's so little variety and thus play soon becomes tedious.
Game went down well on ZX Spectrum with YS giving it 8/10, S.U a full 5/5, but CRASH seemed more grounded and gave it 52% saying gameplay was merely of the Left, Right and Fire variety.
Never seen Amstrad CPC version so cannot comment.
Atari could of at least altered the sprites and made the gameplay less arcadey, that way it would of stayed truer to the classic original.