[Edit] - This is all about your "LettersFall" game. I guess you're working on a game engine too? I didn't see any information about that though. The download link in your first post is broken. I tried a web version I found on your site though.
It's OK. I mean, it works. It's not particularly any fun though. If it was a bit easier I could see it being a decent time-waster that people would play on their phones though, like solitaire. For it to be casual you need a lot more vowels, or a
lot more time to search for words and plan moves.
The 'backspace' button should always be in the same spot. Since it's in a different spot for each letter, it's hard to undo multiple letters quickly. If it was in one spot you could easily tap it a bunch of times in a row. You could also add a 'de-select all letters' button.
There seems to be a significant delay on the pause button. If you press it once you have to wait about a full second before it will work again.
The story text is reeeaaaaallly slow. If it's not going to all show up instantly, it should at least appear at a fast reading speed, so it doesn't slow people down. Also, clicking once should make all the text appear instantly, then clicking a second time should start the game.
If you expect people to use the web version, you should make the Enter key work in the menus, not just Space.
The visual design is kind of terrible. I don't know if you got all these assets for free somewhere or what, but it's like you had a different person design every single different button, graphic, and piece of text. Nothing fits together. It's busy and inconsistent and therefore not appealing to look at. I assume you won't be changing this game much at this point, but maybe for your next project, consider partnering with or hiring an artist to handle the graphics. Or even if you do them yourself, try to be
consistent. Consistency is much more important than artistic quality in this case. Pick a theme and stick to it. Use the same limited palette of colors, shapes, and styles for everything. Decide what the most important things on screen are, and give them the highest contrast. Check out
this article for some good info on that.
The same feedback applies to the audio. It's not as obvious as the graphics, but it has the same issues.