To make this a little easier, you can grind points on stages 3 and 4.
There is one set of eyes near the end of stage 3. You can destroy the eyeballs for 500 points each plus whatever those annoying Igors are worth. It's going to take about 40 seconds to reach and defeat the boss of the level so don't linger too long here. On the next stage, you run into the eyes much earlier in the level. Make a save once you reach this pair of eyes and just kill the eyeballs for 500 points each. The eyeballs die in one hit (I had the sword, don't know if the whip does the same damage) so you can rack up 1,000/ 10,000 /100,000 points pretty fast.