[General]
Oh, look, we have the same Kiai times~
I suggest you disable the countdown like Metroid's diff.
Also, I would've said to use a soft sampleset at certain parts, like the soft/first chorus, but I see you did some slidertick magic there, and I wouldn't want you to redo all of that.
BTW, make a normal-clap for custom1; different skins will clash with your custom slidertick2.
One more thing: BREAKS. D:
[Easy]
01:01:474 - Consider a 1-repeat slider instead of those two hitcircles w/ a break in between?
What a short diff.~
[Normal]
01:43:064 (5) - Consider deleting this?
[Metroid Mix]
00:30:029 (1) - Move to 00:30:131? Adjust spacing if so...
00:36:029 (5) - Extend to 6 and then delete 6?
01:11:063 (5) - Sounds a bit weird when sightreading this along with the music.
02:24:046 (2) - Try adjusting this slider so the endpoint is centered while the slider is still curved.
[Hard]
Very cool. Couldn't find anything wrong here.
Nice SB there, Metroid. And nice maps, guys~