This game has a fun concept! I've been a fan of plenty of matching games, and mixing that with the magical girl battling was a great idea! The GFX and audio all work well, and the intro is cool.
The gameplay itself was very hard at first. Even after reading the instructions, I found it difficult. After a couple losses, I started to get the hang of it. In the end though, I discovered the most effective strategy was just spamming keys like crazy, and only slowing down to think if my timer was getting low. In a way, this IS a strategy, but possibly not the intended one. (This strategy got me through all the enemy types)
If I had to say, it's problem the control scheme that led me to this strategy. I don't have a solution of the top of my head, but the controls were complicated enough that I had a hard time using them deliberately .
Still, I had a good time overall, and with a little tweaking this could be a ton of fun!