Here is a new Super Plusha demo. It contains a new optimized engine and some GFX improvements.
Download and unpack super_plusha_demo.zip (908k) into a blank folder. Then set your GP32 into the link mode, then run PC-LINK 1.3 and click OK. Then use PC-LINK main menu to install the demo.
( File / Install / Select unpacked Super_Plusha_Demo.FPK )
List of improvements: