There is no upgradeable score system in this game. It's all about shooting enemies and picking up items. The only known scoring challenge is the way you pick-up the golden ingots. - see below

If you collect the golden ingots by chance, you will notice that your reward varies between 200 and 2000 points.. The secret is their animated reflection. Find the right moment to pick up the ingots: The brighter the reflection, the higher the score !

200	500	1000	2000