[nidnogg]

Play Store link (from this comment) is dead. A bit on the morbid side though, no?

[david_allison]

Fixed link: https://play.google.com/store/apps/details?id=com.machineryc...

[machinerychorus]

Perhaps a bit morbid, but very realistic. Death comes for us all, even if you ignore it. By consciously forcing yourself to confront it you can reduce the chance that you'll wind up with a ton of regrets when you're old.