Not exactly. But the only upgrade I have in my inventory is the oil lamp and three bombs. I would like to know if choosing the option to have the upgrades of the game should show more items in the inventory (I think I also own the maxed out upgrade sword.)
I completed the game on normal difficulty.

Anyway, thanks for reading. The game is amazing. It is also the spiritual successor of Megaman X in terms of level selector games in which you upgrade your character with items. Thank you very much.