Thank you very much for the feedback on the reddit! This is really interesting and helpful for me.
This is my second project on Unity (first for web) and to be honest, at first I did not plan to publish it. It was a training project, where I experimented with the movement of enemies, building construction, physics, upgrades and damage types. But then I got carried away and started adding too many mechanics, this is largely improvisation. Hence all the disadvantages of this project: bad UI, save system, no clear planning, non-user-friendly navigation, and absolutely terrible code. Therefore version 1.0.5 is the last release (then there can only be bug fixes).
This is an experimental game and I made a lot of mistakes and got enough experience while creating it. All user feedback and especially the discussion on reddit will greatly help me in creating something more user-friendly and thoughtful in the future.
You're welcome!