Its kinda old but I know it well: U.F.O Aftermath.
Never deligate anything,
Take the area 51 mission as soon as it becomes available,
Battleships always attack bases,
Reticulans are the easyest fucks in the game at the start but they get tough fast,
build a lab,get "twighlight and fall" then build a factory and setup the "goodwill campaign" it speeds up recrut rate and missons you dont take can suceed,
shoot every UFO you see,
when the biomass shows up keep that ************ away from your bases it destroys them immediatley and you must have psycic principals and a few other things to push it back.