The different levels are a nice change of pace, the random tile one though can get really frustrating at higher levels, got 8 turtles in a row while the enemy side filled up. Only suggestion is to level up the most commonly appearing units in those levels and hope you get lucky.
The gameplay is alright the extras are... workable though it could definitely use some work. But seriously the blackjack mini game is by far the worst blackjack I've played in ANY video game and I'm including actual video slots in Vegas.