You have ants. (Zen mode)

You are guarding a box of ants. They like to explore and the box has no lid. The ants must not escape! Drag back any ants that climb too high.
Jam year: 
2018
Diversifiers: 
DESIGN - I’ll be there in a minute
Platforms: 
MS Windows
Tools and Technologies: 
Unity (any product)
Credits: 

Peeter Virk - ant expertise, coding 

Jekaterina Gorohhova - sprites 

Taavi Luik - music, coding advice (credit only)

Laura Loolaid - concepts & goals, copywriting