About the glowing Orb:

im not sure, but on my screen it fly arround and stop far on top totaly unmoving. If i click it once, it moves like crazy zig zag and a chest apears.

Since im able to hit it that way "easy", i found:
- coins (the same amount on your current monster, so it's useless)
- ticket for the spin wheel
- a heart (happen only once, but nice that theres a chance to get one)