The first Solarobo video actually shows more than crate throwing. Mech riding canine-hominid Red Savarin repels missiles and slams enemies into the ground. It appears that, players have to mash A before they can get into a throwing chain combo.
Red can step out of DAHAK-AZ103 (that’s the name of his mech) too. On foot, Red pulls switches, swims, and defends himself with a sword.