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I've  tested and it fully works on my A500-Mini. Check video at the end of this post. 
I recommend that you don't rename it from the original scorpion_dev.lha name. Also, you should do the config below, which tells your mini to use AGA chipset, among other things.

1. Copy scorpion_dev.lha to your Amiberry device into THEA500-Games\
2. Copy the following lines into THEA500\whdboot\game-data\whdload_db.xml after the whdbooter element is opened (should be line 2):

<game filename="scorpion_dev">
<name>Scorpion Dev</name>
<subpath>scorpion_dev</subpath>
<slave_count>1</slave_count>
<slave_default>scorpion_loader.slave</slave_default>
<slave_libraries>False</slave_libraries>
<slave number="1">
<filename>scorpion_loader.slave</filename>
<datapath>data</datapath>
</slave>
<hardware>
PRIMARY_CONTROL=JOYSTICK
PORT0=JOY
PORT1=JOY
FAST_COPPER=FALSE
JIT=FALSE
CHIPSET=AGA
SCREEN_AUTOHEIGHT=TRUE
SCREEN_CENTERH=SMART
SCREEN_CENTERV=SMART
</hardware>
</game>