Very original idea! Took me quite a while to figure out the mechanics, but then I finally made some money! (more than from gamedev, haha). The tension when you are getting close to alert 5 is good, combined with the colour changes as you progress, I like it.
Perhaps just more of a tutorial and like others have said, a difficulty curve would be good.
I actually stumbled on your YouTube video about the gamejam, so I was going to go out of my way to play this one. :) And thanks for playing ours!