Well..
I agree with what others have said. It was very fun. But it could use some improvement. Real improvements aside my biggest beef would be you can't kill the wallace chatter without killing the rest of the sounds. Ok so areas of improvement.
1. Like other people have said having a second point of attachment would have been great. It could have amped up the skill required in the game and gave us more options for building.
2. As others have said the game does lack challenge. Most of the rooms can be completed with a simple thin wedge or a thin hook. This really plays into comment 1. Simplicity is sometimes the best option. But it lacks challenge. Honestly the hardest level was the big wedge and that is just because it liked to get jammed in the space. Sadly the advanced manipulation levels were among the easiest.
3. The signs. Obiously you are trying to get some message accross about copyright and inventing, but frankly they are more annoying than anything. Especially as it does not pause the game when they pop up. Damn the signs.
4. It is frankly short, I know long games take more time and resources, but it is still a bit short.
5. And also as others have said the ending is a bit anti-climactic. And neither wallace or gromit appear in the game, which i found odd.
Overall though great game, I hope to see more wonderful work from you. In fact I am going to go check out your other submissions.