Okay I just beat it. That last mission was actually a bit challenging, but with no penalty for dying other than sometimes robots reclaiming a room, I had no fear of death. I only died a few times.
One strategy I found was that if you clear a room before destroying any of the orange cargo containers (which seem to contain nothing besides traps anyway) you get the shield recharge bonus. Then if you destroy a container with a trap, the room locks again and when you destroy the trap you get the recharge bonus again. That worked pretty well since most of the time the trap was a weakling spider or enemy that could do no harm if you let it crawl in your face for five minutes.
I'm not sure if I'd buy it though. It was by far the best Flash game I've ever played, but $10 is actually a significant purchase to me right now and there are all kinds of other games being released these days for around the same price vying for my dollar. I'm looking at you, WiiWare!
Although, if the stupid Defend Your Castle
can make it to WiiWare, I see no reason why Robokill couldn't. I might actually enjoy this game more if I could use the Wii Pointer to aim and the nunchuck to drive around.
In fact, I pledge right now to buy Robokill for Wii if it ever makes it. I'll even buy it twice so I can "gift" it to my brother.