Thank you so much for playing the game and offering your feedback! The game is supposed to have five main levels plus some end-game content and an infinite mode. I'm designing all of the game's infrastructure now (minus the infinite mode) so that adding more content will be significantly easier going forward.
That's actually a really good point about having context-sensitive keys. I don't know why I didn't consider that before, even when I was thinking that the controls were a bit cumbersome. The other points are all valid too, and I'll be sure to consider them as I refine the game further.
The crash you reported was fixed in the 0.014 build, as somebody else had caught that as well. But good point about the electric barrier - I'll be sure to address that.