Stickman Sam in the High Fly Sky is my first Ludum Dare submission ever and honestly the first complete game I've ever done. Kind of an endless runner type of game (endless flyer?). It is pretty simple, two buttons control it:

Right-click and drag to fly Stickman Sam across the screen
Left-click to use your super power to kill all the bird (Sonic Scream). Using the super power will deduct 10 stamina, so use it wisely as you can kill yourself.

Catch power-up to up your score and help you on your journey as you grow higher in the sky and grow your score.

As you flap your wings, you'll lose stamina. Don't lose it all or it is game over. Stopping flight will cause you to fall and regain stamina at twice the speed you lost it, but don't get careless and fall off the screen or you'll lose.

Power-ups include:
Heart: Increases regains some of your stamina and gives you bonus points
Star: Gives you a large score bonus
Booster: Gives you a rocket booster that allows you to fly faster and not use stamina while doing it. And because you are not hard at work flapping your wings, you also regain stamina during the limited time you have the booster.

Avoid birds along the way, they can spawn at random points and come from any direction.

I'll try porting this to a playable web version, but for now it is Windows only (sorry!). Also, the game should work in any resolution but I was only able to test this on two computers.

Source code on GoogleDrive in Zip format as well as the game.

[EDIT]
HTML5 version up on Itch.Io (see below). Works best in full screen
I noticed most entries are posting the tools they used:

Game Engine: Unity 5.3
Language: C#
Graphics: Paint.NET
Audio: Combo of Audacity & Bosca Ceoil (http://online.boscaceoil.net/#!/)