(from the translated manual)

default U.S. Keyboard configuration:

Arrows: Movement/Cursor

Z key: Weapon A/Confirm

X key: Weapon B Cancel/Skip

C key: Hyper Dash

V key: Hyper Attack

A key: Lock On (Nearest Enemy)

S key: Lock On (Farthest Enemy)

F2 key: Pause

Space: Screenshot

ESC: Exit game

The four weapon and Hyper buttons are essential parts of the gameplay, thus it is recommended to use a gamepad. Controls can be configured at startup.