Thanks for the great feedback! Right now the letter pool is a fixed probability for each letter. It should be ~40% of your letters are vowels, which if you're like me and carelessly make short words with multiple vowels, then you will start to run dry. I do recommend using the spells and items to manage your letters and find more of what you need. In the future I think moving to a system where the odds change based on the letters you are holding could help to make the experience smoother.