Here are a couple suggestions to help improve the game:

Summon related suggestions

• A different life bar color for friendly units (including minions) to help identifying them among monster packs during a fight (very important missing feature).
• Having icons that display the current numer of minions of every kinds (for exemple an icon for hunter swarm minions displaying the numer of minions of this type that are still alive)
• Having the ability to group summons into different packs AND being able to give diffrent orders to each of those packs (for exemple if i want to group all my hunter swarm minions into group 1 and all my golem into group 2 and being able to order group 1 to attack a target while ordering group 2 to attack a different one).
• Minions should focus on the target that they player is currently attacking by default (very important missing feature).
• Having the ability to order your summons to attack a specific target (very important missing feature).
• Minions should be able to move by themselves when something is blocking their line of sight while shooting at the target to prevent them from shooting at a wall, rock or pillar (very important missing feature).
• Minions should always teleport to the player location if the player moves away from his minions even during a fight (very important missing feature).

General suggestions

• Having an option to disable vocal error messages (for exemple to prevent earing the game telling you that a skill is still on colldown when pressing that skill button).
• Different colors for number text related to a specific damage type (for exemple a red color for fire damage related numbers, a light blue color for ice damage related ones).
• Stating clearly if a bonus is additive, multiplicative or invert-multiplicative (very important missing feature).
• The minimum roll range of any item of a higher tier than another one should always roll a higher value than the best one of the previous tier.
• Fix the magic find cause it seems to not even work as of right now (very important missing feature).
• The UI shouldn't prevent you from clicking to move or attack when pressing the mouse button at a spot where any part of the interface is displayed.
• There should be an icone for every currently active buffs displaying its remaining active time (very important missing feature).