Nice! Glad to hear you like the achievemets, that makes me want to expand uppon the system :))
And I agree, with geisers creating more geisers it quickly gets out of hand. Decreasing their spread or increasing the time between eruptions would probablt be good for balance.
I'm working on a pretty big update atm, where I'll be introducing a 'Favor of the Gods'-system. Where sacrifices are expected and ignoring the Gods results in more 'bad' events. Can't wait for it to be done! I think it'll add another dimension to the gameplay :))