According to the page, from green to red does not subtract any point but running twice the tests with errors subtract 5 points? Kind of arbitrary rules that have nothing to do with TDD if you ask me.
If we assume that this would legitimately motivate a developer to change their behavior, it seems like it would just incentivize them to run tests less frequently.
<p><pre><code> If you test run fails twice, TDGotchi is upset.
</code></pre>
I believe that should be "If <i>your</i> test run fails twice, TDGotchi is upset."