Okay, Shiki III.
Difficulty: It's simultaneously easy and hard, depending on which character you use. Some are much better than others. The game gets significantly harder on stage 3, mainly because there's a fuckton of box-like walls that block your way. If that's not annoying enough, there's another catch! They disappear over time, but they can still kill you. To keep them visible, you have to shoot the glowing things on the screen, which will temporarily reveal them.
Music/sound: Eh. Not great, not bad either. Voices can get kind of annoying, though.
Gimmicks: It shares some similarities with Imperishable Night, in a way. Each character has a special attack-- some easier to use than others-- and using that attack as much as possible will yield more coins, therefore more points. Yeah, there's a special attack where you absorb bullets and they fire back at enemies. That's exclusive to the loli character. Each character has 2 special attacks to choose from, too, so there's a lot to experiment with
There's also a mode where you can play as 2 characters at once, switching whenever you wish (think Imperishable Night). Personal suggestion: Munchausen and Roger. They start acting like.... eh, you can find out for yourself.
For the price, Shiki III's worth it. I got it for like $20 last year.
