It's a nice game idea. But I feel like there is not enough feedback for the player. Like how many orders are open or when they are running out of time. It's difficult to get a feeling of I'm running out of time. It felt like I just randomly lost because I missed to many orders. It might be intentional, but as a player I don't feel like I'm in control.
Still a good entry for your first game! Just needs more polish.