This app was mentioned in 7 comments, with an average of 1.71 upvotes
I was just scrolling through the Play store after reading this post and saw this app - Walkr: Fitness Space Adventure - might be the sort of thing you're looking for.
I've been playing Walkr: Fitness Space Adventure for years, but recently I've also started using the features that let me play together with others around the world. Now if I walk in the real world, then not only I, but also a few others get energy in the game.
I've also found a walking game called Monster Walker, but haven't played it much.
Walkr: Fitness Space Adventure is a game I just came across myself on Google Play. While it does make you wait a lot, during this time you can generate Energy by walking, which also works for biking for me. Android only though. Google Play
If your biking movement for your legs are about the same as your walking movement, try Walkr (iOS) (Android). It's a space themed incremental thingymajigy.
And then there's this entire reddit post. Props to /u/GameCatW for making these amazing games!