You can see how many of my creatures were blocked. Opponent should be able to select all (of their creatures). Then assign all to block my creatures (defaulting 1 to 1 if their selection is trying to block another selection).

If there is a remainder of their creatures (who are not assigned 1:1 in blocking), they can choose to switch what stays alive or assign the remaindered to block elsewhere.

That I dont think my opponent had any draws or outs. However if they did, they deserve to not take lethal from a 2/2 that could have been blocked. And yes opponent was struggling to assign their Scute Swarms as blockers.

If I thought they had a reasonable out, I would probably have scooped up than confirming to go to lethal damage. I would have felt dirty, cause opponent could have left a message, “I need to top deck River's Rebuke as my one out”.

Lets make the client better and catch up on dev debt.