Really cool game idea! I like the slimy sound when you grab something :P
I think adding some moving obstacles would make the game a bit more interesting or maybe some collectibles which can be grabbed with the slime arm :)
And also: More slimy sounds xD
If you like to play another game with a ball (No slimeball sadly) which needs to collect little bubbly things try out our game aswell: https://itch.io/jam/gmtk-2019/rate/463199