(I literally have not tried a single other thing. I made a typo on the very first command I wanted to try. I tried ctrl+c to start over, and it did not recognize it.)
EDIT
I gave it another chance. If I start a bash shell, it recognizes ctrl+c, but it does not recognize the up arrow key. Not impressed. Don't get the hype. Sorry.
EDIT2
Is this being brigaded? It's the first result on HN without clear reason, and I'm being downvoted immediately for posting this feedback. What's going on?
https://github.com/zeit/hyper/issues/1127
https://github.com/zeit/hyper/issues/1126
https://github.com/zeit/hyper/issues/1121
https://github.com/zeit/hyper/issues/1129
EDIT3
OK, seriously, what's with the downvote brigade? I'm at -3 now.