The green cubes were a last minute addition, they're power-ups(health, instant reload, increased range, etc). In my post jam build I've added a little more visual distinction between them to make it more obvious! The physics of the sphere have also been altered since, I felt it was really sticky because it was bouncing off enemies as they died and bouncing off skulls as they were collected, so now it just rolls right through them and eliminates anything in it's path. I've also added lots of audio and visual feedback to abilities and other interactions like taking damage, so it's beginning to feel more alive!