Azrash you need to upgrade towers to punch though the armor, at higher levels its about 2-3 fully upgraded towers. Trojan_56, i assume its so it appeals to english people too, so we dont feel left out! lol, and ILCK it is anoying yes :( but it may be fixed soon! lets hope!
Quite easy.
To make it a little harder you could lower the amount of health a health pack gives you but increase the spawn time, as getting to 100% all the time is a little cheaty :)
Apart from that its a really good game 4/5
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