LÖVE

To be completely honest, at least on my system, the escape one didn't want to work some of the time... even though i assigned it to one of the buttons just like the enter's index... dunno.

kill -9 "processID" works fine...
But in fact i too experienced those problem

(The X in the corner still works, even if the popup window's button doesn't, which it does, just not on pressing escape, only on mouse clicks.)

Sorry for bump, but based on another thread, i updated the .love file in the OP so that the Enter and Escape keys will work with the popup dialogue on Win7 x64, at least.