This theme is a pretty tricky one to work with. But, I think I have some ideas that could work with this theme and with what I'm planning. If these ideas don't work out, I'll just throw in some random concepts in my head:

Collect 'em All and Farming Simulator

Puzzler and strategy

Sandbox and Text-based adventure

I could mix and match with these genres, or just go with what I'm originally planning, which has a "collect-em-all" feel to it. Or, I could ignore all of this and do whatever.