Thanks for playing! I didn't force the use of spaces as I wasn't sure how to visually communicate this to a player and thought that it may lead to frustration if the player didn't realise they'd missed one, but the capital letters is an oversight on my part - can't believe I didn't notice in playtesting lol
I've added a slider in the downloadable versions allowing the player to set enemy speed to their own preference, as the difficulty has been commented on by a few people, hopefully it'll be helpful for those who want to set difficulty to something more in line with their skill level or preference :)
Cheers for the detailed feedback, really appreciate it!