Blocks for Babies presents an unexpected fusion of classic puzzle gameplay and frantic first-person shooting, a combination that has garnered attention for its sheer novelty. The game tasks players with clearing blocks, a familiar premise akin to Tetris, but introduces a menacing twist: certain red blocks do not clear through traditional line completion. Instead, these blocks trigger a shift into a first-person shooter mode, directly evoking the style and intensity of Doom.

Within this FPS segment, the stationary blocks transform into hostile, cubic monsters. Players are equipped with a gun to combat these enemies, shooting them until they explode. This mechanic forces a strategic interplay between puzzle-solving and combat, where clearing the board requires engaging in direct firefights.

Blocks for Babies also incorporates roguelike elements, with players choosing perks or buffs at the end of each round to enhance subsequent gameplay. These upgrades can range from automatic clearing of certain blocks under specific conditions to setting blocks ablaze. As players progress, the game's pace gradually increases, introducing new enemy types and culminating in a boss encounter at the end of each round. Defeating the boss rewards the player with a new weapon for the following playthrough.

The game's aesthetic is characterized by a deliberate contrast, mixing 2D and 3D art styles. The developers have aimed to capture the spirit of a Doom and Tetris crossover, with explosive visual feedback when blocks are destroyed in the FPS mode, complete with a messy, 'guts-flying' visual effect. Players can also influence the difficulty by choosing how many blocks to tackle simultaneously in the 3D mode, balancing greater challenge with the potential for more efficient board clearing.

The roguelike power-up choices and the core concept of a Tetris-like game with FPS combat have been noted as intriguing aspects. The writing is also highlighted for its humor, playing on the juxtaposition of its mechanics. While the initial experience can be a novelty, the potential depth suggested by trailers, which hint at various block types, powers, and even horror elements, invites further exploration into the game's evolving challenges and mechanics.