The only major difference between Counter Strike and Critical Strike Portable is that the latter doesn’t use the Half-Life engine, being based on the Unity engine instead. This obviously translates into some changes to the graphics, although as a personal note, I find Critical Strike to be better looking than its PC counterpart. The touch controls are touted as “smooth and responsive” by the developers, something that resonates with a lot of the user feedback.
If you’re interested, why not head on the official Google Play store link and give it a go for yourself. It literally won’t cost you anything, as Critical Strike Portable is completely free.
P.S. Since we’re on the topic of hardcore mobile gaming, fans of Blizzard’s highly addictive World of Warcraft MMORPG might be interested to learn an iOS version of the game is being considered by the developer, although the possibility of it reaching Android devices was not no yet acknowledged officially. We’re keeping our hopes up and our eyes open, so we’ll let you know as soon as more info surfaces.