Fist of all, Contratulations for all your work and the release of the first demo!
I have been looking for Clive 'N' Wrench since Luigi (@Hello_Luigi) posted some art of the game in Twitter, and is exciting try it now.
The flow of the movement is really good, although grabbing a ledge breaks it, since can not climb to the platform in an easy way, and pressing the jump in that situation makes the character a little floaty and takes time to move forward and reach the floor.
The world thematics are really good, variated and with potential, and the two that we can explore in the demo are good, the size is like Banjo Kazooie, not too big and convoluted (Though I guess that in the future they will be bigger, but you really get the concept of a compact world with enought variety). The boss battle is good but short, and the sake of the screen seems too much.
The music is not bad, but not enought catchy for me, and in certain areas like the cave and the boss battle I barely can hear it. In my opinion, you should modify the audio levels to always hear the world music clearly, and then the special effects. In the same case, when you obtain an ancient stone, the fanfare should be clearly listenable (and if the camera centers better in the caracter being less close, better!).
Even with everything said, is a great demo, and even being an alpha is impressive what has been achieved so far!
There is little bugs like being in the animation of staing close to a wall and attacking, the character do not make the attack animation, and weird things like when you leave the water or walk in a sloping floor makes strange animations, but nothing disturbing.
I hope everything goes well and that it ends up being a great game!