Hell yeah. A zig-zagging path of L-shaped River tiles maximizes the efficiency of these bonuses. This is the build I ultimately beat Loop Hero with. Paired with an Arsenal card, the Rogue gains ...

In this Loop Hero ... landscape tiles River camp building First river tile can only be placed on perimeter, subsequent rivers must build on the first Oasis Landscape-0.5% to hero's attack speed ...

One-handed weapon, shield, armor, and no boots; that’s Loop Hero’s warrior class for you ... you can use the river card to double the effects of landscape tiles instead.) ...