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.
+ Relatively cheap
+ Not that
- 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