There should be key rebinding in the next build.
The level indicator is a placeholder and there will not be a leveling system in the next build released (it has not been planned out).
I've intentionally left the feeding overpowered, since it's just fun to see how overpowered creatures can get for a short demo.
Bestiary is the correct spelling.
Menus should have more button prompts in the next build, so that less people get stuck.