Tunneling, jumping, or ghosting? Those could allow passing over, under or through barriers safely, without rewarding points for their destruction. Ghosting would probably be the easiest, both to render visually and for the player to understand. If the armor pickup currently destroys other powerups (I never had that situation), maybe have this powerup allow picking up others while it's active, to further differentiate it
Good ideas! I do want one that makes you dash (tunnel or ghost) forward suddenly (and destroy everything in a straight line).
I was thinking instead of a laser, some fireballs or something that shoot forward and bounce off walls unpredictably.
The armor power-up does not destroy others, no.