Sure. For the vegetable cutting one, it is too hard to cut the vegetables and I think you'd need a better way to differentiate between the foods you were supposed to cut and which you shouldn't (maybe red and white outlines?). The antigravity one needs some skill... perhaps make the first part of the level a bit easier so new players can learn how to control it. The King of Cards and Gem-swap thingie were too easy (you always had to click like twice or three times on the same items and you won). I didn't understand the one with the Turn to Stone... until I did, but that was probably my fault for not reading the instructions well. Another issue I had was, that using the buttons or using the keys either didn't always work or were just too hard, when you could just click on the game-display and it worked better.