Hello and thanks for the feedback :)
Yes, the input need some fixing for faster registration.
There is an inventory panel which you can open by moving your mouse cursor to the top of the screen. I will add a popup animation to this panel for picking up items. It would make more clear where the items are stored.
I'm also going to adjust the arrow keys. I was thinking about up and down for forward and backward movement, and right and left keys for turning, if it would be a good compromise.