Enter to select default button on main menu is confusing.

[DDR0]

Enter should select the currently highlighted button, which is currently activated with attack. Both should work, really. :thinking:

Reasoning: This took me a few minutes to figure out when I tried navigating the menu with the arrow keys, and I make the game.

This issue surfaced during investigation into https://github.com/frogatto/frogatto/issues/547.