Simple, yet engaging
This game is great. The easy controls are very intuitive and allow you to go through the levels with no difficulty. The achievements are tough, but still attainable enough to make you want to get them. Each level had something new and interesting to add, making this game engaging until the last level.
However, the Hard Controls need work. They were simply to finicky for my tastes. If you bump the chopper against a wall or flip over, you'll have a hell of a time getting it back out, as most of the time the "flick" technique will make your mouse go off the screen and autopause the game. Although the Autopause was a great way to try and make it more fair, I got sick of having to stop and start over and over again. If you put the controls on "feather light" to make it easier to flick without getting the autopause, you can barely control the helicopter the rest of the time. Plus, just sitting on the ground the helicopter is moving. This made ending a level difficult sometimes, as you'd touch down only to move away from the exit.
The hard controls added another element to the game, but where before you felt like you had direct control over everything and difficulty was based purely on your own skill, with hard controls some if it felt more unpredictable and "cheap." It sucked all the fun right out of the game.
My advice, screw the hard controls. The easy ones are still fun after beating most of the levels on hard controls, and the achievements are a better way to add difficulty for people looking for a challenge than changing the control elements in my opinion.
Make more!!