Would be a good little time killer between tasks, but it absolutely destroys my phone battery. Nothing to do with my device - I've done the math and a comparison with the 'State of Survival'; this game kills my battery a little over 3.5x faster than that game! I suspect it is due to the fact that there are Ads after every single level (some of which cannot be skipped, other can be after 5-15 seconds). £10 for ad-free? No, thank you. Uninstalling.