Enter is apparently bound to "inhabit"... that won't work because we never finished the code for it, and we've removed that functionality anyways. F10, as Morgul said, is the "exit" key... we've been getting segfaults on exit for a while, and haven't yet figured out how to fix them. We'll keep poking at it and see if we can get it to behave for the next version though.
Thanks for the bug reports!