Well I just 1cc this on MVS difficulty. Ended up with a score barely over 50,000,000. I missed the challenge star on the last stage, almost 1 lifed this game. I think missing that challenge star really cost me bonus points. I'll probably play some more this week and post a better score with a picture in the high score thread.
Challange stars stack on eachother if you get them all sequentially. Stage 1 =100,000. Stage 2= 200,000 if you get the challenge star again. Stage 3 =300,000 bonus if you get the challenge star again and so on. If you miss the Stage 4 challenge star, but get it again on Stage 5, you only get the 100,000 bonus on stage 5.
The regular bonus star pickups have some sort of dynamic point system that I can't figure out. At first I thought you get 2,000 points for each one, but I soon noticed that just about halfway through the first level they are already giving me about 15,000 points each. The value of these stars keeps increasing throughout the game, I even had some that were worth 90,000 points each in later levels. Anyone know how these bonus stars work?
Gemant is a little off on the point system for hostages. If you hold on to them until the final boss and survive, you are awarded with 500,000 each hostage, plus a 500,000 bonus if you save all 5 which equals 3,000,000. I know it's not 600,000 each because if you finish with 4 you get a 2,000,000 bonus, not 2,400,000. Not that important, just clarifying.
Where exactly can you milk points in this game? There doesn't seem to be too much. One place I know of is on stage 5, you can milk the T-Rex under the destructable stalagtite for awhile, and if you don't destroy him another one will show up, but I think you lose out on a hero hostage doing this. Not sure if its worth it.