I opened the game but I didn't know what to do.
Then I closed the game and look on the plage for controls or explanation.
Then I opened the game again and look for some tutorial, guide or something.
At the end I pressed all the keys looking for the controls.

I think that its a important part for the player to know what to do and how. 😥
Just a short description like:

A game in develop, you have to reach te stairs with both characters.
Use WASD or arrows to move and switch character with Q.