Toodee and Topdee

Toodee and Topdee is a unique indie puzzle-platformer where two merged dimensions collide. Players switch between Toodee (a 2D side-scrolling platformer) and Topdee (a top-down puzzler), altering the rules of the game to solve mind-bending puzzles, defeat bosses, and restore universal balance

Here are some of the best similar games that feature perspective-shifting, dimension-merging, or dual-character mechanics:

FEZ

Degrees of Separation

Trine

Super Mario Bros

Braid