Hey :) Thank you! You're right concerning "Schreiben". tbh that simply didn't come to our mind, but now that you pointed it out - it's obvious haha. German is our native language, so we didn't use a translator.
At the moment it's not possible that 2 letters of the same type are on the screen at the same time. But you're right, they can spawn twice in a row after the first one vanished.