This isn't a creation but I've found out how to fly with a stickman.

If you wish to go sideways, do this:

1. Look in the opposite direction you want to go to and shoot.

2.  Jump and start walking the direction you want to go.

3. Hopefully you should start to go really fast in the air.

If you wish to go up, do this:

1. Don't look anywhere! If you have already moved, kill yourself.

2. Jump while shooting

3. You should start flying upwards infinitly

Thank you for reading!

P.S. I have created a level about it. You get a sore of 1 - 5. Hope you enjoy it!