DOUBLE CLICK the green flag. Press g to start. Press z to shoot. Press space to block. Every time you block you lose 1 health.
NEW SHIELD DESIGN! For 17 games we've had the same design, but now it's updated and new. This Impy variant is weaker than its predecessors. This is because it's only a fragment of Impy. That's right, all of these versions of Impy are only parts of him. You'll see the full version in the finale.