Yes, we can share this info.
PM was:
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I found when pin-wheel appear and disappear. It's simple. Ufos moves on spiral. Spiral has two points: when any of ufo's touch first point wheel appear, when any of ufo's touch second point wheel disappear.
Look picture:
http://www.gramtech.dt.pl/destructor/nyny.png
When ufo touch black point wheel appear, when touch green point wheel disappear. You must manipulate which ufos shoot first, which next for get more chances to kill wheel.
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Best (longest duration and easiest to shoot pin-wheel) spiral is when enemy ships move from left-down (as on first stage) or right-down side and fly simply to right or left to second side of screen. If you watch my inp you can see that I always wait until enemy ships fly out from these places.
And I found next info. On Phase 1 enemy ships appear 8 times and next they speed up, on Phase 2 - 6 times, on phase 3 and next phases enemy ships don't speed up then from phase 3 you can wait for best spiral infinity.
Interesting is word REPLAY1 under statue which appear when you get score 10000. But for what is this word I don't know.