Just note the following are just personal opinions and add more "beautify" to the game.
Do you have any ideas for other sound effects? I can't think of any other fitting sounds for Unzan.
- Well let me see: Unzan appearance se = se_ufo.wav and his fists hitting the wall are missing sfx. Use: se_tan00.wav
- Remove the unzan fist firing sound or replace it with 50% muted se_power0.wav or so.
- The anchor firing bullets ( add a kira00 or tan01 or something here )
- The sfx for reversal movement is perfect! Leave it.
- You can perhaps also use se_don00.wav for the fist hitting the walls.
But like I said, this is just to beautify the game making it less dull and more "action paced."
I got further no comments because it is simply awesome.