This is one of the best bullet hells here avaliable on Steam (of course it's not touhou but it does its work pretty well), and it's totally worth it (more if you can get it on sale). The third part of the Gundemonium Recollection, and a vertical scroll (instead of horizontal like its predecessors), with very charming characthers and of course a japanese touch. The other two games of the Gundemonium Recollection are great too, so if you want to get it, don't doubt it.

Hitogatta Happa would be a game that you'll hate to hate. It's a quite engaging little manic shooter, DoDonPachi-style, based on a buyable/sacrificable ship-bomb mechanic.
A somewhat interesting feature that you'll forget rapidly when you'll be confronted to the load of flaws that the game suffers and the intense amount of frustration coming from cruel and unusual gameover mechanics (You need to suicide your doll/ship on the boss to bomb him, and inflict enough damage to kill him before the timeout, whatever your skill is, this becomes overly complicated passed stage 2).

Buy it only if you're really into manic shooters and are looking for a new game to beat.
Otherwise, I can only advice you to spend your money on other games.

4.5/10

Pros :

+ Relatively cheap
+ Localized
+ Not that bad

Cons :

- Glitchy controls on keyboard
- Unreadable action
- Terrible HUD
- Uninspired patterns
- Unfairly punishing "instakill-on-timeout" mechanic
- No visible hitbox ? Seriously ?
- Locked in 640*480
- Gratuitous engrish everywhere.
- Frustratingly near from being an actually good game

If your an huge fan Touhou games and other doujin bullet-hell games ypur gonna love and have a super fun playtime with Hitogata Happa and the rest of the Gundemonium Collection. Hitogata Happa is a super fun, enjoyable, and challenging doujin bullet-hell game that has an awesome soundtrack and gamplay with lots of characters to play as. If you huge anime fan then your gonna love the artstyle of Hitogata Happa, and i've been an fan of anime and manga all of my life. I recommend the whole Gundemonium Collection because it's an super fun, fantastic, and cute doujin bullet-hell game series.

If you want to enjoy this game, you NEED to read the manual. Playing this blind is odious and how you need to play it is not as obvious as most other shmups.
The thing about having to crash against the bosses to kill them is interesting, but just as you would think, is very annoying to pull off since if you get hit by a bullet it negates the explosion and that's what's most likely to happen as you near the boss you're trying to attack.
The thing about the game entering sudden death mode when the timer runs out on the bosses, sure, it enforces the suicide bomb playstyle expected from the game, but will be an immediate turn down for anyone who, like me, came expecting a traditional shmup and didn't look for the manual. So, hopefully, you'll read the ♥♥♥♥ing game up. It still makes boss fights really annoying if you take too long to beat them, which is more likely than not since you'll spend most of your time running into bullets while trying to suicide into the boss. Hopefully this problem is solved once you give yourself enough practice and time to learn the game, I did not give myself that many.
One thing I remember from this game is that there were a couple patterns on ♥♥♥♥ing easy that did not ♥♥♥♥ing belong on easy.
One thing that bothered me a lot is that once you die, you get a short time to select a new character to send out, which you can select with the arrow keys. DON'T. Just ♥♥♥♥ing DON'T. If I want to select a new character before spawning, at least let it be only with the actual character selection keys. It's REALLY annoying when I set some character to be the next one to go out, and then when the current one dies, a completely different one is sent out because I didn't let go of the arrow keys or I pressed it too early.

The closest thing you can find to proper bullet hell on Steam.

Hard, no surprise, but it gets harder. Instead of playing as a single character with 4-some lifes, but instead, you play as a dozen dolls with a maz of a dozen lifes each, only if you have to gems.
Unlike Touhou, bombing is both the real challenge and the main gimmick of this game. To bomb, you need to survive until your FLOW bar maxes out, and then, RUN FACE FIRST INTO THE CLOSEST ENEMY YOU FIND, WHAHAHA!!! Seriously, when you run into an enemy, your doll explodes, doing massive damage and basically killing everything inside it's lengthy radius. It's the only way you can beat many of the bosses without Timing Out, Timing Out = Hard to dodge bullets and No respawning, you die there, game over.

Hold for the nigh-unfair difficulty, and dumbass doujin game devs not knowing what the hell the options are, or what a mouse is, it's the closest thing to bullet hell you can get, and is it hell.
Dark Souls can suck it.