Nice idea. However, putting just one letter on gold or gem, even without forming a real word works fine :)

I also didn't really get the error system as I was spelling words and it was giving me errors. 

I took a video of your game, you can check it out here! http://bit.ly/bean-stream

I was a little confused at first because I had no letters. I think it would have been beneficially to spawn 5 or 6 letters off the bat. On another note, I spelled out "Delete" and it told me It was an error, so I didn't really understand the whole error system. Other than that, I played the game for about 10 minutes (on and off as I went to grab a drink to let the first initial letters build up, and it was pretty good overall.

fun game! I think it would be cool to see this as a finished game with some more polish and more upgrades in the shop or something.

I found out that you can place tiles onto other tiles though, I don’t think this is intentional but I’m not sure.