Oh my God, there is a certain bug when you pick up the item on the very first cell of the arena. I didn't have time to fix it, and I guess it's related somehow to an infinite while cycle. I was relieved that most people never faced this problem, but seems some do. Sorry for that, but I will fix it without a doubt.
And thank you very much for kind words, it really means a lot to me! Glad you liked the game :)