Uh? The extend is at 2M, you should check your settings.
The game engine is actually pretty refined, but it has one basic flaw: only Zetto Dyne and the Plus Alpha ship are good to use, other characters are a goddamn pain. Well, stage design is a bit lull in places, but good nonetheless In general, chains (i.e. triggering the 46,650 aubergines) revolve around doing three things:
1) Simple chain, i.e. destroy stuff, collect aubergines and keep destroying enemies (autofire is a good help, also charge shots);
2) Chain with extra exploding aubergine, i.e. start a chain and then destroy an enemy which will release the said exploding aubergine, for 6x46,650 (or more than one enemy);
3) Chain with bombing, i.e. the one illustrated in the other message;
Other scoring tecniques are present, but I can't recall how they work
At any case, many chains are not exactly easy to pull off, last stage is a perfect example. Also, there is tech suicide to replenish the bombs, but I don't really know where and how. In short, I don't know much about the game...