Ah, ok... i will try when i get home.
I am always surprised by how difficult it is to explain game mechanics in my games. This time, I created a png explaining all key features with some screenshots.
https://chillzombie.itch.io/survive-a-game-jam
Maybe you could do something like that as a starting screen? You can also add it as a screenshot to your game page.
Another alternative would be to create a visual indicator that shows in which direction you will soon move, and with what kind of force. But I don't know if you have time for that?