Hi, here are some assorted remarks on the GUI and HUD.
First of all, I think the health should be definitely be more present on the screen, because it is very important.
The options menu could be improved slightly by moving all controls-related stuff to their own tab (I know I said it already, I post it here for completeness).
And overall, I think the font is very small. This is especially noticable on large resolutions.
Post your comments on GUI/HUD here as well, as you please.