Suggestion: Make it more clear what is blocked!
I just lost a match because it was very unclear which creatures I was actually blocking. On cluttered board states it becomes very visually confusing how Arena represents this. The lines used to indicate this tend to overlap, and like creatures such as tokens are clustered together in ways that make it visually unclear if they are actually blocked even after attempting multiple times to block them.
I would suggest that blocking creatures should be moved around so that they're placed in front of what they are blocking as directly as possible, as players would do in paper Magic, so that lines cross over each other as little as possible. Also, instead of clumping like creatures together so it's visually confusing if they have been blocked, they could be staggered or shifted back behind the other creatures so the individual creature is still clearly visible.
This would probably greatly improve the user experience on these cluttered, token-heavy board states. Players ought to be able to look at the board after declaring blockers and be 100% sure what creatures are blocking which other creatures, that's a basic feature of Magic.