i played a little bit and was having a lot of fun, but sadly my GPU couldn't handle it for some reason. Even in the main/starter screen of the game, my GPU is at 98%. While playing the game it sounds as if my computer is on fire.
I have played several games with better looking graphics such as Diablo 3, LOL, Overwatch and never had problems.
I also tested to make sure the GPU was working properly with the software "UserBenchmark".
If the performance issue is fixed, i would gladly pay to play this game.
downloaded Castle Constructor Alpha 3.0
GPU: Nvidia GTX 1060-6GB
CPU: Intel Core i7-6700K