The concept is really cool, but your game is very obscure. I ended the game with a score of -3920 without having output any energy because I couldn't find how (and I read every help window I could find). The game ended when I clicked "Scram" not knowing what it would do...
I understand where you came from in regards to the limitation, but I feel like it gets more annoying than anything to have those pesky pop-ups, and that certainly didn't help with the comprehension overall.
I am REALLY impressed by how the game looks though, I had the opportunity to use Windows 98 and even 3.1, and I felt right at home. Absolutely well done.