The UI is quite nice. Cohesive aesthetic throughout. Quite enjoyed the color palette, and responsive UI touches throughout the game. Being able to interact with the falling letters on the main menu for example.
The gameplay is pretty clean and intuitive. The special characters are confusing / disruptive, but maybe that is intentional (so you could use a power to get rid of them or something).
It would be cool to see the point benefit for spelling longer words - or something to make longer words feel more satisfying to complete.
Being able to compare your score to a previous run would be nice as well - so you could see if you were ahead or behind your previous score.
Overall well done! Nice tidy game :)