How do the coalitions work? Are the ideologies based on the party names? It’d be cool if you modeled the top real-life parties for each country and so if you chose a real-life party you’d have to pick policies that appease them (i.e. liberal policies for Democrats, conservative policies for Republicans) in order to maintain your coalition. And if you chose different policies you might lose your previously loyal voters while winning over some moderates.
The opposition party names are irrelevant to their policies, its just a randomly chosen name for every party. In a two party system, the opposition take a polar opposite view to you on all issues. In a 3 party system, the second opposition party places itself between you and the main opposition on all issues.