Hi ! i can't use the items, the game says to place them some "square number, i did but when i press the number on the keyboard nothing happen... so i can't pass the first mission... thank you the game is great !!
(sorry for the bad english)
Sorry to hear that but I don't think re-installing will fix the issue. It's possible to beat the mission without any consumable. The trick is to avoid all off the unnecessary confrontation. Other than the big Axe wielding robot and the stage boss, you are not required to kill other ones.
Let me know if that help you beating the first mission