Thank you for your comment and time spent playing my game!!
I think the 4k display is a very useful note - I don't have one myself and none of my friends do.. so that feedback was never given before! I may look to add a scrollable zoom in/out feature after the judging, to work better on higher res displays.
I think I have also overlooked communicating that the intention was a rage-game, so the yellow chests aren't intended to do anything, I hadn't intended for the player to be able to even reach any and instead just be an extra level of rage-baiting, that they could be seen and might have something good inside and then never be able to reach.. but I think after a round or two of character tuning, I unintentionally made it possible for a few of them to be reached - so that's something I need to fix too! ;)
I will check your game out today, and leave you a comment too!