Definitely an interesting setting, especially for dice to show up. Though I will say they're a little weird here in the way they're implemented. Most of the game I just ignored them because they were either a little too distracting due to placement to roll for something good, or they weren't hurting me enough to be worried about them.
I feel like maybe having the dice on the character in some way could help with the issue of being unable to see it. Since that way it's where you're main focus is going to be. Rather than pulling your focus away tot he bottom right. Same thing I'd say with the health bar. Though that's a bit more understandable since you can just glance at it whenever. Whereas the dice you have to be watching for when it warns you to roll it for a good buff.
Although there's no punishment for missing the roll so you could just spam right click and always get good buffs. Which sort of removes the point of having it be a timed thing in the first place. I feel like it might be better to just have it be "roll the dice, maybe it's good maybe it's bad". sort of thing. Rather than if you DON'T, then it's always bad. Or it could be that there are separate dice rolling, one for the enemies one for you, though that would end up giving both sides a buff so probably not.