Use the arrow keys (or vi-keys, if you prefer) to choose an action from the list of highlighted things. Do that action by pressing space or enter. Keep doing that until you've won or decide to go do something else.
Excellent question. Next!
It's camels on opam. Install opam and then you can install with:
opam install camels
Consult camels --help for alternative invocation modes.
You're running it on a potato. You can disable expensive floating-point eye candy; consult camels --help to see how.
Sure does. You can tell it to save somewhere else with camels -f.