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1/5 because i dont like to play a game for 2 hours to figure out in the end that this is just a DEMO! Moreover, when you click a book inside game menus it redirects you to some kind of fan page and your currently played level getting erased, so you have to restart it - i though its just a bestiary book, but no. There must be exclamation marks for such issues! Lastly - this game is another clone of Kingdom Rush with same towers, lenght, upgrades, everything (but less heroes)... Charging money for clone? Even without demo issues it cant be rated high, like 2 or 2,5 max. Seriously, go observe GemCraft 2, the developer was able to create something fresh and unique out of his concept, and you have just burrowed your's game 'under the shadow' of Kingdom Rush's glory.
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Here are official tutorials in HDq - https://www.youtube.com/watch?v=KUS0X5Vupjg&list=PLv6AvVTqwCaME0g5ec3vJL1CH0YRlMr4Q