I think I broke this game in more ways that I thought possible.

Sometimes the letters don't go into the bag, unless I place another letter to take its place,
The walls don't have collision,
The letters can spawn in the void,
and finally: Sometimes when I grab letters to move them, I go flying along with the letter, can only move up or down in a reasonable sense, and I move at around 1000 miles per second across the infinite void.

Thankfully I can still stir myself, and somehow I managed to get 40 or 50 points while in a level like that. Which is kinda ironic, because on the next level like that, I got -10 points once the timer ended. Now what you need to know is: I had 140 points before that, but I started going out so far out into the endless void, that I got a score of -1 at the end. No idea how that happened!

Edit: Oh, I forgot to mention that I did have fun playing. The bugs didn't make the game unplayable for me, quite the opposite. If there weren't bugs, I probably wouldn't have played around so much, it was hilarious!

Nice! The controls and movement for dragging letters around is a little wonky, but apart from that, nice idea, and nice execution!