Today was my first day playing Glitch and I had a great time. I was quite dissapointed when I had to leave for work :) There were a few small UI things that I thought could use another look.
It might be easier to drag things to the slots within the bag (or backpack?) rather than them having to go straight onto the bag. I did this a few times before I realised I had to go through the bag.
I had some trouble planting seeds in my garden. This, as it turned out, was because there were already some seeds in the plots. It might be useful to have an explanation of why you can't plant seeds there, such as 'this square already has X seeds,' I wasn't entirely sure what the red rectangle indicated.
When I wanted to sell something to one of the merchants it was a little counter intuitive to click to 'buy' to get to the section where I would be able to click to sell.
Also, at the moment the only way to save seems to be the save and quit feature, in these early alpha stages it might be useful to have a regular save button, where you can then continue playing. Alternatively, if the game automatically auto-saves, you could change the 'save and quit' to just be 'quit,' kind of like how the iPhone doesn't have save dialogues.