Nice idea. However the maths is properly screwed. E.g. If I have 1 shredder and 1 teabagger then if I micromanage them so they are permanently working then I can theroretically make 36 credits a day profit over 5 days. However, adding in an extra shredder (to half the wait to get the tea bagger working) it takes my profit down to 5 credits/day. Also the 'workers' AI could be improved, or just have an option to manage them (without seeing them). At present they stumble blindly around and cannot keep up without micromanaging them. The stock are pointless and lorries need to be unlocked (dunno if that comes late, but got too fed up to play). Good concept, but needs work. If you want to improve it I'll happily send you more feedback if you PM me.
Decent game but you need to show why it's important to have anything other than frigates, they are WAY cheaper to upgrade and buy. I'm assuming their defence is low or something. You need to make stuff a bit clearer and put in reasons and results for diversifying.