OK FIRST I have some ideas
1. Bring back animation. Yes I know it probably causes a lot of lag but it really looks good
2. Change the graphics. Let me Elaborate
Low Quality: Resembles the 2013 - 2014 era of hh and runs similarly but not the same
Medium Quality: Resembles the 2015 - early 2016ish era of hh and is slightly laggier than low but not by a lot
High Quality: Looks like how hh walks again
3. Bring back the instant arrow thingie with archers: The thing where you just tap the buttons to shoot the barrage of arrows into the sky WITHOUT having to HOLD it. Would give players a REASON to be archer
4. Customizations. Allow people to change the colors of their health bar and icons and whatnot.
5. Make magmagons and others like it slightly bigger. It makes magmagons actually frightening to battle. now they are looked down upon by many because they're weak.