Check out this game released by Jimmy Vegas: 

Timmy and Mousey Endless Runner

Why I like this game and I am recommending it:

You get to play as five different characters.

There are about 27 achievements in this game which would take some time to complete.

There is a secret which gets unlocked when you unlock all 27 achievements.

It takes inspiration from well known games like Subway Surfers, Temple Run etc.

You get to run in five different stages of which one is unlocked and the others are locked at the start of the game. But, the others can be unlocked by playing.

The uploader has also given the source code of this game. Anyone who wants to learn game development can download the source code for $40 and they can learn how the game works.

Here is a screenshot from this game: