Very difficult, but enjoyable
I could not beat him for the life of me!! The art is very nice, especially with the petals when you summon. There are a few things I believe could be improved though.
1.) The Tsukishiro move doesn't freeze Deidara.
2.) The Rei-Pressure move takes to much life. Over 15% of it. Which wouldn't be such a bad thing if...
3.) The healing move could heal a little more. Everytime Deidara would throw the stars at me it was like healing didn't do anything...which was frustrating. Even though it's random, it stayed around 35h.p. healing.
4.) Shakkahou seems to be a waste. The quick attack does the same damage without sacrificing reiatsu.
I still enjoyed the game and hearing/seeing the moves, it was entertaining. Good luck with school, hope you get an A++++++ for this!!!