Hello! You can check the key config in the options to make sure the controls are properly configured. It should work properly then.
From the FAQs:
- My controls aren't working, pressing keys does nothing. How do I fix this?
- Go to the main menu, then go to options. Make sure the controls are correct and you are pressing the assigned keys. Go back to the Main Menu, that should save any changes you might have made, if any.
- The controls stop sometimes. How do I fix this?
- You might have clicked outside the window or pressed tab, causing the game window to lose focus. Click on the game window and the game controls should be back.