Mostly economic freedom issues, some civil society issues. These 40 roll call votes do a very good job of separating Republicans from each other, and an OK job with Democrats.
Compared to the 2013-14 Freedom Index, the main thing this one illustrates is how unambitious Republicans have been this session. After meeting the political demand to increase road funding in 2015, Republicans have played "small ball" in terms of reforms needed to make Michigan a more prosperous state.