Thanks for the feedback! Yeah, initially I wanted to have another fierce animal that can put the player in danger and also wanted to put some buildings and facilities that is some highlight event when the player discovers them. But I was a bit too busy on my work and just barely managed to the gameplay mechanism so that you can switch equipment, use item(s) and got anomalies as the only threat to escape/attack.
The reason why you can't use the item is because the vitality is not low enough to use and obviously the switching to the same item is a programming oversight, both of these need to fix and polish. There are some other things need to be polished and balanced as well, such as day-night cycle, weapon strength, initial inventory, placement of pickups, etc. Currently I target some of the fixes and add some new contents in the next update, will release it when I get these things done.
Well, I'm glad you enjoyed playing the game and I appreciate your feedback here, thanks!