Good News Everyone: We've tested the current version of Toddler Simulator with the Steam Deck and haven't had any issues on the device.
Note that native joystick controls are not available, only steam input mapped controls. We've created a custom input map to get you going straight away. Virtual mouse is needed for menus.
Official controls:
Move - Left Thumbstick
Look - Right Thumbstick
Jump - (A) Button
Hit - (B) Button or Right Trigger
Drive car - (X) Button
Customise - (Y) Button
Say "NO" - Left bumper
Vomit - Right bumper
Forklift Up/Down - L4 and L5