Thank you for the feedback! It really helps us figure out how to improve the game.
The bug where squares can no longer be clicked should be fixed in the latest version, Alpha v0.0.3d (your current game version is shown in-game at the bottom left corner of the screen).
You can always download the latest version by going to your Itch library and re-downloading Void War from there. If you are running the latest version and still getting this bug, please file a bug report in our Discord (Discord link is at the bottom right corner of the main menu).
By the way, if you hold down LEFT ALT you can temporarily hide unit tooltips. This can be really helpful when their tooltips are getting in the way.