I played maybe 5 minutes or so, 1 run, there's not enough there yet to make me retry.
I think the Time you have to serve Guests is way too low, and should pause while you're making Dishes for them. Otherwise it feels really hard. I didn't use Portals once, that may be part of it, but it feels dumb when I can walk to the Kitchen and make them there. Camera shouldn't tilt on movement I think, it feels odd, like the Game can't decide between being Isometric or not.
Sometimes Guests felt a bit hard to click, it wasn't quite clear if I had to click on their Order Icon, or on the Guest. Guests also shouldn't all come alone I think, some People may go to a Cafe as a Pair or a small Group. You can keep most of them alone, but just occassionally a Group could be interesting I think.
Food making could require more Steps, or a form of choosing Ingredients in the beginning or something, depending on how far you want to take this, you could also allow creation of own Dishes, based on Tastes or something like that.
The Charging Minigame's Lightning Bolt should indicate if its about to run out I think, I was consistently pressing again once it ran out, since its too aprupt.
I didn't really encounter any Bugs I think, again, there is very little there yet. But it seems to all work.
This does offer a lot of Room for expandebility(?) tho, from the above mentioned Dish creation and cooking recipe improvements, to different Types of Guests, designing your Cafe to your Tastes, and to attract different Types of Guests, a Town with NPCs around it, a Shopping Area to get your Ingredients, which forces you to balance how much you buy, in order to not spend too much, since some could spoil, vs. having enough to make the Dishes the Guests want, having the right Flavors they like, and using the Stuff that's currently on Sale etc.
If you want to stretch it further, you could even include some outdoor Dungeons to gather rare Ingredients for your Cafe or something. There's really a lot ofWays you could go from where it's at currently.
Sorry that I can't give more Feedback on what's there, there's just so little, so mostly I can look into what could be coming.