Game didn't freeze. It's just the credits window was so large I didn't know the game was behind it, and I didn't know how to escape. I'm not sure if it would be possible to make the game keyboard only, or do more hotkeys for selecting your own characters. I found the gameplay to basically be click on each character, click their strongest attack, use it, repeat. Having some easier switching (or did I miss it?) to avoid too much frantic mouse movement would be good.
I did see the numbers on the attacks, but didn't see hotkeys for selecting characters or enemies. Maybe enemies could be keyed to numbers as well when an attack is selected? So pressing "3" selects the attack and "2" selects enemy index 2.