Thanks for the comment and review.
I overshot with the scope a bit and that is why some of there are some useful features missing (minimap, hints when placing the buildings, camera movement limited only to the lit areas...).
The problem with repair is caused by pathfinding issues. It is disbled when there are still martians on the the map so it doesn't make defending against them too easy. But they can sometimes get stuck and thus disable the repair.
I hope to continue improving the game and remove these issues.
Hopefully you had a nice experience despite encountered problems.