This game has a very nice core concept, it is very fun to play but only for the first 15 minutes. Once you start earning a lot of money, the game becomes very repetitive.

I think you (the dev) should focus on polishing the current features, adding more variety and random events. Also, I think that you should replace the office with a factory, and force the player to buy some machines once he unlocks a new tech tier.

Keep on this, the game could become a very good one ^^