Canyon Bomber [No sound]

Canyon Bomber (1977) is an Atari arcade game in which one or two players control biplanes flying over an irregular canyon, dropping bombs to knock down terrain blocks, in a direct competition to rack up more destruction than the rival.

It's an archaeological piece from Atari's early years, from when the studio was still experimenting with simple physics and direct competition as the core of design, before its big late-70s hits.