A fixed-screen shooter with no weapon of your own, you root your ship, open a beam, and turn the enemy's own bullets into your ammunition.
The formation above rains bullets at you, and you can't shoot back. Instead, hold the beam: while it's open you're anchored in place but you catch incoming fire into a magazine. Release to hurl that stored barrage straight back at the formation. The catch is that beaming roots you, so you must choose between dodging and gathering ammo.
A fixed-screen shoot-'em-up in which you have no weapon of your own.
You root your ship and open a beam that turns the enemy's own fire back on them, so every shot you land was theirs first.
That inverts the genre's resource. Normally the enemy's bullets are the hazard and yours are the solution; here their volume of fire is your ammunition supply, and a quiet screen is a problem rather than a relief.
Backfire is an original free browser game that reinvents the fixed-screen shooter by removing your gun entirely, building the whole loop around absorbing and reflecting the enemy's own bullets.