Four bros from Broforce: Rambro, Brommando, Bro Hard and B.A. Broracus, drawn with the real sprites and animations from your own copy of Broforce (running, jumping, knife attack, crouching).
Their guns: Rambro's machine gun chews through dirt, Brommando fires rockets, Bro Hard's pistol hits hard, B.A. Broracus brings a flamethrower. Each gun uses its Broforce sprite.
Their specials, three per life: grenades, a five-rocket barrage, flashbangs that stun and confuse, and proximity mines.
Bros drop in: when your bro dies, the next one drops in on the spot with his own gun and special. You start with 4 bros in reserve, and every 1000 pixels you dig down frees a caged bro.
Everything else is Noita: its falling-sand world, enemies, spells, potions and perks. You can still pick up and use Noita wands.
Single player.
Needs Noita and Broforce (both on Steam, Windows). Broforce isn't started; its sprites are read from your installed copy when you press Play, and none of its art is shipped with the mod.
Credits
Broforce by Free Lives (bros, guns and projectile sprites, read from the player's own copy).
Noita by Nolla Games. Made under the Noita Modding Agreement; free and non-commercial.
AssetsTools.NET by nesrak1 (MIT), used to read Broforce's files.