Wow that was nice! The lightning ability was very satisfying, when I managed to pull it off and zapp a lot of enemies at onceDidn't figure out what the yellow one does
The yellow dice are extras. Each up you pick up increases your total dice capacity.
On a good run, you can end up with 11 or 12 dice, and then the lightning attacks get really fun. :)
Ah thanks! Now it seems so obvious :D