Games like Urchins and Ink
Games like Urchins and Ink include Zup! S, Planes, Bullets and Vodka, Bit Blaster XL, Vampire Survivors, and Beat Hazard. We matched them by the tags players give Urchins and Ink on Steam (Casual, Education, Action, Twin Stick Shooter, and Puzzle): closest matches first, and among equally close ones the better-known games.

Zup! S
Shared: Casual · Puzzle · 2D

Planes, Bullets and Vodka
Shared: Casual · Action · Shoot 'Em Up

Bit Blaster XL
Shared: Bullet Hell · Shoot 'Em Up · Casual

Vampire Survivors
Shared: Bullet Hell · Casual · 2D

Beat Hazard
Shared: Twin Stick Shooter · Bullet Hell · Shoot 'Em Up

Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Bullet Hell · Action · Shoot 'Em Up

Cyberhunt
Shared: Casual · Action · Twin Stick Shooter

Zup! 2
Shared: Casual · Puzzle · 2D

Unpacking
Shared: Casual · Puzzle · Cute

Zup!
Shared: Casual · Puzzle · 2D

Pikuniku
Shared: Casual · Puzzle · Action

Time Wasters
Shared: Twin Stick Shooter · Bullet Hell · Casual

Geometry Wars: Retro Evolved
Shared: Casual · Twin Stick Shooter · Bullet Hell

Zup! 3
Shared: Casual · Puzzle · 2D

TouHou Makuka Sai ~ Fantastic Danmaku Festival
Shared: Action · Casual · Bullet Hell

Assemble with Care
Shared: Casual · Puzzle · Indie

Touhou Kouryudou ~ Unconnected Marketeers.
Shared: Action · Bullet Hell · Shoot 'Em Up

Zup! 8
Shared: Casual · Puzzle · 2D

Minishoot' Adventures
Shared: Twin Stick Shooter · Bullet Hell · Casual

A Little to the Left
Shared: Puzzle · Casual · Relaxing

Is This Seat Taken?
Shared: Casual · Puzzle · Cute

Muse Dash
Shared: Casual · Cute · 2D

Assault Android Cactus+
Shared: Twin Stick Shooter · Bullet Hell · Shoot 'Em Up

Gensokyo Night Festival
Shared: Action · Casual · Indie