I like this game! However there are some things which can be improved:
1. When there are two words starting with the same letter, the game forces you to type one of the words first, then the other. I suggest allowing typing either of the words first.
2. When there are many words on the screen, and you finish one of the words, some letters in other words get highlighted. You can't start typing them from the unhighlighted letter, you need to type them from the first letter. However, the game thinks that you mistyped and completely erases the nuke progress.
3. Until the 8th level the difficulty remains the same, however it suddenly jumps at the 9th level where enemies start spawning too fast. And, it becomes impossible to get another nuke from this point forward because of the bug described previously.
Please fix the issues, the game is really cool, and I see that it was made with love!