Sweet game, I have a few tips and a few questions
It's a good game.
First, tips for other players. The game isn't hard provided you use the correct strategy. Start with a saw near the entrance, and upgrade it until it does 2 damage (don't get the last upgrade). Build walls around the saw so that the enemies have to go all the way around it on both sides. Then build a second saw, and again upgrade it until it does 2 damage and add walls. Then, build a charge coil near the exit, and upgrade it as soon as possible. As far as I can tell, looking at the numbers, the upgraded charge coil is by far the best unit in the game in terms of damage per second. Add walls to make a maze so that the tanks are on the field for the maximum amount of time before they get to the coil (it's pointless to add extra walls after that since the next wave will come). Then just keep building and upgrading more charge coils near the exit... I have 5 of them now, paused on level 38, and one of them has over 13,000 damage stored up on it.
Am I correct in thinking that the number of hits per second, is equal to the firing rate / 40? Because the first level laser seems a lot weaker than I calculate it should be, by that. Or do units have some kind of armor against low damage? Also, I noticed that when I put it on 3x speed, units got through, and then the next wave I set it back to normal without building anything extra and all units were stopped. Unless the next wave was easier than the previous one, I think that 3x speed decreases the relative damage your units do.
