Initially made the mistake of trying to play with a trackpad...which did not go well. :)
Had much more success with a mouse! (Seems like a game that could also work well with a joystick/gamepad controller.)
Really liked the use of the subtle simple square-wave pattern in the background to give the arena some visual interest without creating visual noise.
Found gameplay a bit challenging initially but also had a few rounds of "I'll just try *one* more go" so that speaks well to the game's ability to walk the fine challenging/frustrating balance line.