I've stayed still in the top left corner and I seem to be surviving indefinitely. The cats also vibrate erratically which isn't very visually appealing.
I have now reached 320 seconds on the timer and the cats no longer spawn in the bottom left, but rather are all shaking on the right side of the screen. It gets boring very quickly because of the lack of music or any sound for that matter.
Overall this game is very poorly developed as it poses no real challenge and is an eyesore.
To improve please add music and make the cats able to reach all parts of the screen. You could also add a visible cool down timer for the leap that the mouse can do.
Uhhh just reached 1000 sec and decided it was time to see what happens when I get hit by a cat. There IS a cat sound effect but is replays over and over again because it spawns more cats each time I get hit instead of starting over and removing the previous cats on the screen. It also forces me to the top right of the screen where cats always are making it near impossible to survive more that a second due to the influx of cats on the screen. But hey, at least it didn't crash?