This looks more like an app prototype for rolling dice than a real dice roller as it doesnt do much of anything practical. For example, say I want to consistently roll 2 pairs of d8s, one pair in blue, the other in red, and compare totals. Cant do it. A good generic dice roller should let you choose quantity, type, and color of dice to be rolled. And then maybe even set that up as a template you can come back to multiple times. By choosing a template, you could start by rolling a couple of d6s, perhaps 1 white, 1 red. Then maybe switch to rolling your dice in blue simultaneously with your opponents dice in red, customized to roll a d8 and a d10 for each of you.