Space Giraffe hurts, but it's a good hurt. Not past level 5 yet but for 400 points it's a bargain.
+1
On my first try after playing the tutorial I played it Tempest style even though I tried hard not to (hardwired in my brain it seems).
Didn't have much time yesterday, but after 4 rounds I'm up to level 13 or something.
I can see it's pretty confusing and hard for casual players (and certain reviewers) though. You really have to learn how to play it.
Bottom line: for me it has that 'one more try' factor, so it's all good.