These tutorials are good, but a bit lacking. Telling people to make several different classes that do basically the same thing instead of explaining inheritance and polymorphism at the end here makes it feel a bit rushed.
@Xiaoma: AS3 is an improvement because it is more powerful, flexible and reusable than AS2. It also runs up to 10x faster. That's like asking how C++ is better than BASIC because it is harder to understand...
Needz moar dwarf, giant and supergiant stars. Plus you could add pulsars and black holes for teh lulz. It should go Dust cloud -> Asteroid -> Planet -> Sun -> Red Giant -> Supergiant -> Black Hole. Then you start collecting stars, which turn into clusters and you became one big ass galaxy.
3/5 : Needz moar upgrades and replay value, plus it's flawed since the effect of the pumps compared to the accelerator is unbalanced meaning how well you is based almost entirely on the luck of finding more accelerant.