I feel like the mechanic is interesting, but there was never quite enough feedback for me to grasp it.
At one point, I actually managed to clear all the enemy slimes from the screen, and nothing happened. Another one just spawned. Is it a highscore game? If so, where's my score?
There seems to be a UI bug, where arrows just get left all over the level.
The slime art is really nice, and the squishy sounds were satisfying.