Based on casaul obversation the game points are something like:- most points awarded for damaging buildings, a bonus if its completely destroyed.
- points awarded for damaging vehicles, possible bonus for destroying it.
- enemy harvester has a nice point value attached to it if you damage/destroy it.
- infintry are worth the least points.
Ladder scores are based, obviously, on whether you win or lose. Beyond that individual scores I'm not sure of since they don't appear to relate directly to your game points beyond the fact that whomever gets the most game points will receive the most ladder points.