Room for improvement.
For a solo project its a pretty good game! But theres a couple of things I found playing it that I would like to bring up.
Firstly, I'm not sure if this is intended or a bug, but when you get a second lightning bolt while your first one hasn't yet finished, it doesn't do anything. I think it would make it more fun, if the electric fence timer reset from the beginning if you get a second lightning bolt.
Secondly, although I fully appreciate how hard music is to come by, especially when your working solo on a project such as you have. And I Have noted the mute button. But I believe good music is a huge part of a gaming experience, and the loop used in this game I found to be just a bit too short, to the point it did get a bit repetitive and irritating. I would recommend trying to find a slightly longer loop with perhaps a bit more depth to it.
All in all though the graphics and game play are pretty solid so considering its a solo project, I gave you an 8. I hope my comments can help you with future projects or any bug fixes.