Hiroshi Iuchi—director of Treasure's celebrated 2001 shoot 'em up Ikaruga, as well as its predecessor Radiant Silvergun and more—has a more recent genre entry called Kokuga. Thankfully, we'll get to try out his latest work sooner than expected, since Kokuga is officially set to arrive in the Nintendo 3DS eShop tomorrow.
The official English site for Kokuga lists it as being available to download in North and South America tomorrow, with Europe and Australia to follow sometime in June or July. G.rev (Under Defeat, Senko no Ronde, Border Down) has it priced at $14.99.
Here's an older video of Kokuga in action: