Thanks! I'm glad you enjoyed the game:)
The items were an afterthought actually. One is just for repearing the damage, and the other one is to boost the speed (to make the boss battle easier).
But now that I'm thinking about it, I should've cut that completely, and spend this time adding sounds instead.
As many people mentioned, the movement in the beginning is rather slow, so I could just boost the speed from the start. And the repearing stuff could just be an automatic one of before the boss battle.