Leap Day

Leap Day is an endless game-- I mean level based mobile game (geez, why does everyone hate the word endless for Nitrome games?) with 366 different levels. They aren't ll unique since it's similar to Spelunky where there are multiple premade level pieces that are programmed to randomly appear throughout a level. There are only about 800 uniquely designed level segments and one level contains 30. This leaves us with about 10100 x20 possible combinations, so it's not quite endless technically. The levels are generated from a seed where in this case is data from the  gregorian calendar.

You control a jumping character who can't stop running just like in Platform Panic, except you can't control the direction they're running in so you have to run into a wall so you can switch directions. There is a double jumping mechanic that works very nicely where you can double jump after you've touched a wall or stomp on an enemy, so in a way you can utilize more than 2 jumps if you're clever about it. Another unique feature is the method of killing enemies. It's just like any Mario-stylized platformer, but you can kill enemies now just by stomping on their noggin, but by having your character move downwards as the enemy makes contact with you, which was actually something you could do in the original Super Mario Brothers. This way you can kill an enemy from below as long as you're moving downwards as they touch you.