I will play it and give you a detailed list of issues that I can find. (Since finding flaws seems to be my specialty). I'll post it below once I've finished.
NOTE: I did everything via the package menu of .0 pre19
Sanae Boss Beta by Ultima
-Please use .ogg files for music in ph3. It saves space and is the standard used in Japan. You can use audacity to turn .mp3 into .ogg.
-No select SFX used when choosing difficulty
-You use Absolute pathing. You should not require the folder to be named "Sanae", and you should DEFINITELY not distribute a file that is stated to use a package and then require its components to be in specific folders. Please refer to Helepolis's paths and directories tutorial.
-Also, what's up with that Mitori title screen? O_O
-The pause menu's images are low resolution.
-If you are on the pause menu try to return to the title menu, you get this.
http://puu.sh/4MP92.png Also, boss music continues to play even when you return to the title screen via this method. In this mode, trying to load a replay fails and returns you to the puu.shed menu. It occurs in Spell 1, Nonspell 2, Spell 3, and perhaps more scripts, but does NOT occur in Nonspell 1. Once, it went to a black screen and no keyboard input was able to resuscitate it.
-Reimu's power is not shown. This poses a problem since SA ReimuA uses power.
-When in the pause menu, returning to the game can cause cheapshotting a little too easily.
-In the select screens, the slow alpha changes of the images makes it hard to see which one you are currently on. I suggest not going completely transparent, and making the alpha change significantly faster.
Nonspell 1: Crushing, colors unlike Sanae. But it's nice.
Spell 1: Fairly simple. Feels like a non spell though. Nice job with Sanae's background though. You did a good job with the effects.
Nonspell 2: Nice job here/ However, it feels like the first attack, since the patterns are basically similar. Also, feels like Ichirin. Also, there is a LOT of lag when the player dies. Also, the cross patterned bullets always spawn in the same place. Try using different angle increments, because it's impossible to get under Sanae.
Spell 2: Nice spell. Seems very Yukari-ish (SA Stage 4), but it's nice anyways. Butterflies don't fit that well though.
Nonspell 3: Nonspells are getting pretty repetitive. Background is nice, but... Yeah. You need much more non spell variety.
Spell 3: Fabulous idea. Note that you're basically dodging bullets from the right though.
Nonspell 4: WOW. By far, this is your best non spell. It is AMAZING (although the bullets are a little too fast and shiny)
Spell 4: Meh. Looks fine, but... Just not interesting enough.