Thank you very much for your feedback and your time to leave such an extended comment.
We are currently working on a better visual clarity for object which can be manipulated. This a often mentioned request.
Regarding your tilemap issues with the red line - no one else mentioned it yet. Could you give us some insights of your settings while playing? Most likely the scaling of the game on higher resolutions might have some impact here. Nevertheless we'll keep in mind people playing on different resolutions.