I regret having a completionist attitude towards this game. Currently I have completed all levels across the first three tiers, am now level 184, and have spent way to much time playing. :)
It's AS1. Both AS1 and AS2 compile to virtual machine VM1 thus you can cod AS1 in an AS2 doc. Also, it is just as easier fr new developers to understand how to write AS1 without using scripts attached to movieclips. This is bad practice for a number of reason and often leads to confusion later on as the scripts are potentially located all over the place instead of being consolidated to a single frame or external file.
This game will teach you how to use a very old version of actionscript as well as bad and deprecated coding techniques. Surely, if you are wanting to teach people then at least teach them using up to date technologies.
The car doesn't feel right, no drift and turn does not relate to speed. There is also no way of replaying it... which isn't to bad because I have no intention of playing it again.
Took me a bit to work out how to start the game. Perhaps you might want to add English translations int the game or in the game description? Otherwise, kind of boring game. I stop playing before I got to see if anything else happens other than shooting targets.