Hello :)
Sure, you can swap the keys for the arrows:
In Lobby scene: Events → Player mechanics → Send message → For PC → Key pressed (& Key released) → Here you can swap the WASD with the arrows (Up/Left/Down/Right).
In Game scene: Events → Player mechanics → Movement controls → Send message → For PC → Key pressed (& Key released) → Here you can swap the WASD with the arrows (Up/Left/Down/Right).
As for the game rules, i will double-check the game again to make sure the rules are working correctly.
My discord: vegetato
Feel free to Dm :)