If you like pinball games, then yes, I'd go for Alien Crush without hesitation. The music is quite nice and, as ClodBuster said, the screen flipping is not a problem (I don't begrudge folks who prefer scrolling, but this game, IMHO, plays fine, especially on a small screen like the TurboExpress).
The intricate, creepy visual themes (Giger! + "light-hearted" bonus screens) + superb music create an atmosphere that really makes Alien Crush a slam dunk for me (I never tire of the visuals), but I reckon it could wear thin if you are not as smitten with Giger...
...and, with pinball, you spend a long time looking at and listening to the playfield (I have never been as smitten by the themes and atmosphere in Time Cruise, for example...my reaction to Alien/Devil's Crush is more visceral).
The CRUNCH and CRACK of alien skulls getting smacked around is pretty satisfying, too.