Youkai Douchuuki is generally known as that really cheap HuCard thrown in random game lots, along with other Namco games Genpei Toumaden and Wonder Momo.
Unlike those other two games, Youkai Douchuuki doesn't suck. It's a very fun action-adventure game that you can blow through in 15 minutes.
I'm not gonna give many tips, but I will say buy the bottle that costs 2000 gold. It helps you jump farther and run faster. Also only buy the first ki upgrade.
If you can reach the fairy fountain in stage 2, you can earn an extra life!
Use this guide for help, there's a PCE walkthrough in here too.
http://strategywiki.org/wiki/Shadow_Land