Cute. Great story. TERRIBLE puzzles. The game devolves purely in mousing over the entire screen over and over to find out exactly what sequence of inane moves the author has decided is the solution. There's no real good way to solve these puzzle through logic.
Great game, but I must agree that the pacing is off. Needs a way to increase the rate of spawns. Maybe "send next wave" button?
Would be nice if the bunkers were translucent so that we could see the troops.
Most importantly: We need a note mentioning the effects of various upgrades. What purpose does the M1 serve, for example?