Dinosaur Doesn't Jump Or Duck

After finally figuring out how to set everything up, and running the index.js file and pressing s, the dinosaur doesn't actually jump or duck. It just walks right into the first cactus, loses, then restarts again, and it keeps doing it over again.

Start by running index.js and reproducing the failure after pressing s. Trace the jump and duck behavior from that entry point; the issue is resolved when the dinosaur responds to those actions instead of walking into the first cactus and repeatedly restarting.

Written by the indexing model from the issue text.