Here's the scoop: "Growsim" will be fully released shortly and I am going with a free version. Early play-testers have moved on to other projects and feedback is scarce, so I can't in good conscience release a premium, paid version without further testing.
"Growsim" will be completely free--all features will be unlocked and available, no strings attached. When it is available, links and updates will be posted. Expect the full version by 1/12/14, the latest.
I will attempt to push "Growsim" to other platforms, as well, so stay tuned if you're interested in the game for a particular OS.
There will be an option to donate to the project via PayPal. If you'd like to support future projects, along with updates for "Growsim", consider donating. All donors will receive a cheat sheet with all the in-game unlock codes (along with a description of what they do).
As I update the game, any new information will be posted. Occasionally, I will post one of the secret game codes on this site.
Thanks for reading.