A fun and appealing puzzle game
I highly enjoyed the visual style of the game, well made puzzles and the music fitted the game's visual theme quite well along with the few sound effects available in the game that are cute and seemingly in the right spot, and together the overall composition creates an appealing puzzle game!
I would love to give this cute and addictive game a full review rating, but there are a few tiny things that I would like to suggest that would perhaps further improve an already great game; 1) the counter up in the left corner distorts the game's visual coherency so I'd suggest that you create a counter that is visually coherent with the game's graphical style (although you've already done that as it can be seen in the walkthrough, so is the NG upload an older version?), 2) and even though you've chosen excellent symbols up in the right corner for the available in-game options I think that, just as you've already done with "walkthrough" and "music off", adding to the rest of the options a simple guidance word would simply further visually aid the player, 3) and also, perhaps, adding a new in-game option that quickly sums up all the tips shown in the game and the keyboard controls explained in a quick and easy way, 4) so lastly I suggest a "level select" option in the menu allowing the player to simply select a level in the game to play (perhaps only available after completing the game?). However the suggestions are trivial in the end for it is already an excellent game!
I highly recommend this fantastic puzzle game! What about adding some medals? Expand the game? A sequel?