Great game, the campaign can get tough at points, the sludge is the worst, but over all well balanced. You get a free second hero after 21 days, which is a huge help with the more difficult levels. You wont always be able to max out mission stars with out the second hero but overall plenty of challenges and missions to keep you busy. Other than the difficulty of the dang sludge its a blast to play if you like tower games. Its a game that you wont beat over night unless you spend but Ive only spent three bucks so far after 25 days. Research can take awhile but each upgrade makes old "impossible" levels doable. Its free do it! And you can disconnect your wifi and never have to watch a video!
Justin bertelli about Alien Creeps TD