I like it. I wish they'd bounce off each other too! - to incentivize getting em into the same zone.

Very Cool and quite fun to play with

How do you win a level?

I trapped the critter with painted lines but when the time expired it said I lost :-(

I just predict their path and draw a very tight circle and they explode in just one or two draws :)

It's easier to keep bisecting the area vs trying to draw a circle.

Reminds me of Xonix [0]...

[0]: https://dos.zone/xonix-1984/

Reminds me of the Brandon Sanderson novel, The Rithmatist, where creatures are also trapped in drawn shapes.

Overlapping zigzags quickly trap them. Since ‘trapped’ appears to be determined by the rate of bounces, you just need to divide the area as much as possible.

Resizing the window smaller makes the game a lot simpler.