Level 16, first I couldnt place the defense blocks, tapping would intermittently give a placement square, but this wasnt much of a problem when I realized the attackers were not taking hearts when the crash and burn at the other end of the river. Then the game is stuck.
Aside from this glitch, this game compares to other tower defense games somewhat lower than most; I have played a great many of them.
The graphics are blocky (well it is a block game) and the 15 playable levels are overly easy. The towers are only 1 level of power and the speed of play is not variable.
Id give 2 stars for the game, but only 1 star because it is demonstrably broken.
oZmonKey about Block Defender: The Pixel Defense 3D & HD