I don't think that the boost given for a prestige is high enough. Adding only 0.05 to the production bonus makes very little difference, especially when the amount of money needed for your next prestige doesn't reset.
I am now at 16 production level, which gives me a x1.8 boost which is not much really.
I think that either 0.5 boost per level or the amount of money needed for prestiging never increasing would be a good way to go for this kind of game.
I like it though. I just wish that I could progress more.