You haven't play the PC-Engine until you played all 4 Valis games.
Side scrolling sword action with scantily clad protagonist.
The difficulty is a bit hard. Challenging but nothing Ghost 'n Goblin.
Great visual scene with full voice acting. (The advantage of being a CD game)
Lovable characters. (Art style is a bit dated tho. But that's the charm of it IMO)
There's an english version but the voice acting is kinda....
Well it's up to ppl taste after all so I won't judge it.
Many great games awaits you.
Glad some one recognize the PC-Engine and give it a try.
My other suggestion are....
-Super Star Soldier (Hudson, Shmups)
One of the best and the most popular entry of Star Soldier series. Many types of weapon. Catchy soundtrack. Try it, it's the game that every PCE fans should play.
-Steam Hearts (GIGA, Hentai shmups)
yes, it's hentai. It has many good soundtracks, great voice acting. The best part is the characters. Most of 'em are cat girl..... if you're into it.
-Honey in the Sky (FACE, Shmups)
Shmups again? Well, this one is pretty weird shmups. You don't gain power up. But you upgrade by collecting scores and use it to buy things in the shop.
Best part is that you can warp back to the stage you cleared to collect score to buy more upgrades. Which I think it's so cool.
Also, your ship can fire in 8-directions and you can adjust the direction (one way tho). If you want something different, try it. Great BGMs too.
-Jackie Chan's Action Kung Fu (Hudson, Action)
The same as NES version but better in every possible ways. Better graphics, better sound sample. If you like the NES version, you'll love this version. I guarantee.
-Legendary Axe/ Makyou Densetsu (Victor, Action)
Game of the Year 1989 by VideoGames & Computer Entertainment magazine. Do I need to say some more thing?
-Valkyrie no Densetsu (Namco, Action)
Think of it as an arcade style Zelda, but less RPG-ish. You move from place to place, fight with hordes of enemy.
Collect money to buy better equipment while help people along the way.
Well, enough for now.
OBEY THE PC-ENGINE.
*edit*
BTW, seems like you're Strider Hiryu fans. Why don't you try Strider Hiryu for PCE-CD? Not bad at all, but nothing arcade.
You need Arcade Card system card to play the game on the real hardware tho.