If you go to the subscribestar link in OP, you'll see the developer is keeping their members updated regularly. If people are actually worried - spend $1 or $3 to find out more. For information so people can chill a bit. First of all, it's not even 3 months since the last update.
v0.2 took 5 months
v0.3 took 4 months
If that follows, it wouldn't be highly improbable that mid-November to end of December is a decent approximation for the next update. Even then, there are thousands of other games to play - worrying about games and when they are going to update is much ado about nothing.