Really nice pixel art and it does capture something nostalgic about the older phone games, but with less frustrating controls... I vaguely remember the mix of the squishy phone keys and a one or two frame delay for input making many games very annoying at times.
I also played "Tropiko". Also very fun, with clear visuals.
Have you considered porting these games to Android? I haven't ever used Unity, so I don't have a clue what making a port to a touch device is like, but since both games have a nice and simple control setup and both games seem to have a square display; I think that if you set them up to be played in portrait mode, the top half could contain the game screen, while the bottom could contain the buttons. Since there are only a few buttons; they could be quite big, which would make it less of a hassle to play on a touch screen. I think that if you add a highscore display, both would be quite fun to play on a long train trip.
Neat stuff. Very interested in what other games you will make in the future :)