Consistency: I expected the objects I can interact with to display an exclamation mark... not the case in the end. But I dunno where you want to go, it felt kind of misleading, maybe there a better way to "hint" the player that he gets only an exclamation mark "sometimes".

I played with the mouse and the arrow keys... is control remapping planned? (I run elf/linux, x11, then keycodes are enough, no need to resolve the key symbols).