This is a good version of a great game. The original contains some of the meanest, noisiest aliens around - this reproduction does not let the original down.
Keys are well chosen, the left/right keys being well away from the fire and reset keys. Hi-res graphics are a very good feature of the Spectrum - and are only rarely exploited to the fullest by commercial software: Artic, though, make full use of them is in this fast, smooth game - no jerky movement at all.
The sound is surprisingly good - especially when amplified - and really moans as the aliens scream down, twisting and turning towards you. A nice touch is the "touch the loop" that all the Galaxians do after each "bombing mission". The actual graphic characters - especially the laser base - are almost identical to the arcade original's, and are very colourful. Nine skill levels are also available - but I strongly recommend that you start with the first!
Also available is a two player option - surprisingly rare on most Spectrum games. Minimal instructions are needed, but adequate ones are provided, and the game loaded first time. When compared with similar games at several pounds more money, this game is excellent value for money, and is a must for your software library.