Games like Pumpkin Dog Islands
Games like Pumpkin Dog Islands include Clustertruck, Kao the Kangaroo: Round 2 (2003 re-release), Timberman, Pumpkin Jack, and Witch It. We matched them by the tags players give Pumpkin Dog Islands on Steam (Action, Indie, Casual, and 3D Platformer): closest matches first, and among equally close ones the better-known games.

Clustertruck
Shared: Action · 3D Platformer · Indie

Kao the Kangaroo: Round 2 (2003 re-release)
Shared: Action · 3D Platformer · Casual

Timberman
Shared: Casual · Indie · Action

Pumpkin Jack
Shared: Action · 3D Platformer · Indie

Witch It
Shared: Casual · Indie · Action

Dead Bits
Shared: Action · Indie · Casual

Gensokyo Night Festival
Shared: Action · Indie · Casual

One Finger Death Punch 2
Shared: Action · Indie · Casual

s&box
Shared: Action · Casual · 3D Platformer

Gang Beasts
Shared: Action · Casual · Indie

Pikuniku
Shared: Indie · Casual · Action

Retrowave
Shared: Indie · Casual · Action

Timberman VS
Shared: Action · Casual · Indie

Superflight
Shared: Indie · Casual · Action

Cyberhunt
Shared: Action · Indie · Casual

SpongeBob SquarePants: Battle for Bikini Bottom - Rehydrated
Shared: 3D Platformer · Action · Casual

One Finger Death Punch
Shared: Action · Indie · Casual

Caster
Shared: Action · Indie · Casual

Woodle Tree Adventures
Shared: Indie · Action · 3D Platformer

Minimalism
Shared: Indie · Action · Casual

ALTF4
Shared: 3D Platformer · Action · Casual

Snakeybus
Shared: Indie · Action · Casual

Yooka-Laylee
Shared: 3D Platformer · Indie · Action

Mineirinho Director's Cut
Shared: Action · Indie · 3D Platformer