New blocks guide looks great! Having quick access to the rest of the Haxe names for the functions will be a big help.
There is one technicality I noticed, and I'm not sure if it is a bug, should be a suggestion to look at, or should just be documented--but there's a subtlety in those two "game attribute with name [---]" blocks that's worth noting. Depending on the platform, they either initialize to zero, or null. This could be troublesome if you use those blocks to implement, say, a high score for each level of a game (using the scene name for the attribute name). On Flash, the check "is new score greater than current high score?" works as expected, but on Android (and Linux too, if I recall right) this check fails because you're comparing a number with null. The result is a game that appears to break itself when you try to run it on a new platform