I would add the weapon select info to the game page.
Good to know not to pick up ammo for a weapon before getting the weapon, as I was collecting them as I found them in world 1. I did eventually get ammo, and was grabbing every HP boost I could, in world 2, but did not acknowledge being able to shoot. It may have been for one of the other weapons than I started with. I was also low on health by the time I got to them, and mostly focused on running. Based on world 1 I was looking for the weapons, so in my mind did not have them and was not not watching the ammo amounts. I may have missed it if I did get some. When I next play I'll keep it in mind and try switching weapons.