Ihave on a few occasions encountered a situation where I simply cannot select a tile due to the surrounding area blocking them from every angle, ive even had a combat softlock due to my minotaur being knockbacked into the water in high rise and not being able to click on it to actually start its turn. The softlock could probably be fixed by simply making it possible to start a mechs turn by clicking its icon/tooltip in the top left part of the UI but perhaps some other solution would be beneficial in the longterm (and allow for more complex maps to be built).