Hello there - can you send some more details about your issue to us at steamsupport@hellogames.co.uk so we can help you out? Please include any error messages you get, your system specifications and OS. Thanks!

yes, while the game freezes, the mouse arrow appears, i see the window's circular charging icon and I must to press tab to kill the application
i have windows 7 64bit - athlon 2 3.2 ghz .- radeon hd 4870 1 gb

Thanks, ivaNo. - can you email us at steamsupport@hellogames.co.uk with a description of when this happens - when the game initially loads? When it loads a level? What other programs are running at the same time? Please send us an email with all the relevant information you can think of - it'll help us get to the root of the issue. Thanks.