Subsurface Circular

Controls:
(Click on the game if they don't work)

C - Switch between Pocket (green filter) and Color mode
▲ - Move forward (Up in menus)
▼ - Turn around (Down in menus)
◀▶ - Talk to nearby tek (Switch normal/focus options in dialogues)
L Shift (Start/Select) - Open/Close map
Enter/Space (A) - Select option, skip message.
Escape (B) - Go back to main menu from the map.

You will see the Game Boy controls mentioned in game, as it was designed for Android where it has a touch interface resembling the handheld. Give that version a try if you can!

Note that, for now, "Continue" will take you to the start of the last Sequence unlocked, not the point where you left the game.

Buy the original Subsurface Circular:

Steam
Nintendo Switch
App Store (iOS)