good game but...
Here's my issues:
Bugs: the selection box did not work at all and moving my soldiers about proved a complete pain in the arse later on. The grenades seemed inconsistant sometimes they would explode and just do damage to a few zombies and sometimes they would cause mass chain explosions?
Some improvements in my opinion: The fact that every level i had to start again began to bug me i didnt want to spend all level saving up for a machine gun that i could only use for 3 seconds before the end of the level. I think if you'd have made a few more types of soldiers it would have added more variety to the game as it would leave you deciding on whether to get more expensive soldiers or improve your defences, maybe change the "machine gunner" (who had the worlds slowest machine gun) to a rifleman and add in a proper machine gunner and maybe a sniper [just some ideas]. I also found the difficulty gradient too high, it went from level 4 where i could do it with no problem to level 5 where i got killed in less than 30 seconds lol. Overall it was a good game but there is room for improvement.