Good luck with the studio! I agree with the comment above, get rid of the first text and let the player go directly to the game. There is the help in top, so it would be ok in case someone gets stuck.
Another point, for better marketing and brand awareness, is the name of the game which has to be shorter and if you want to chase keywords traffic, related to the original watermelon/suika game.
Missed opportunity to add some cat sounds, especially alongside the merge pop. After all, this game should appear to cat lovers, no?
Cat book, should be unlockable with characters when you reach them. Also, on click there could be some fan info accompanied with sound to the individual cats. Speaking of which, what's that restart arrow in there?
Rework pause style, to match the game
Remove f10 note. Rephrase the "help us improve" to "feedback" so player knows is something fast action
You may want to consider adding more control keys to the game.
Nice fit with the forecast.
Powerup text should go infront of objects.
Huh, i played it 2 mins, while writing this text, and on my first try to use powerups, the gameplay (not game) got stuck. I suppose it was nice for that time :)
Good luck with the game!