Games like Flappy Tank
Games like Flappy Tank include Kao the Kangaroo: Round 2 (2003 re-release), Grimhook, s&box, Grand Theft Auto V Legacy, and VLADiK BRUTAL. We matched them by the tags players give Flappy Tank on Steam (Action, Adventure, Casual, Racing, and Sports): closest matches first, and among equally close ones the better-known games.

Kao the Kangaroo: Round 2 (2003 re-release)
Shared: Adventure · Action · Casual

Grimhook
Shared: Action · Adventure · Action-Adventure

s&box
Shared: Action · Casual · Shooter

Grand Theft Auto V Legacy
Shared: Action · Adventure · Racing

VLADiK BRUTAL
Shared: Action · Adventure · Casual

Tomb Raider Game of the Year
Shared: Action · Adventure · Action-Adventure

Chained Together
Shared: Adventure · Casual · Platformer

Ratchet & Clank: Rift Apart
Shared: Adventure · Action · Action-Adventure

Need for Speed™ Heat
Shared: Racing · Action · Adventure

Haste
Shared: Action · Adventure · Racing

Rogue Legacy 2
Shared: Action · Arcade · Adventure

Disney Speedstorm
Shared: Action · Racing · Arcade

Need for Speed™ Unbound
Shared: Racing · Action · Casual

Crab Champions
Shared: Arcade · Roguelike · Casual

Owinka Shooter
Shared: Action · Adventure · Casual

Atomic Heart
Shared: Adventure · Action · Action-Adventure

The Big Catch: Tacklebox
Shared: Action · Adventure · Action-Adventure

Neon White
Shared: Action · Platformer · 3D Platformer

Pumpkin Jack
Shared: Action · Adventure · 3D Platformer

ALTF4
Shared: Action · Casual · Arcade

Phantom Abyss
Shared: Action · Adventure · Action-Adventure

Sonic Frontiers
Shared: Adventure · Action · Action-Adventure

Toree 2
Shared: Action · Adventure · Action-Adventure

PAC-MAN WORLD 2 Re-PAC
Shared: Action · Adventure · Action-Adventure