Legendary

grapple force rena should be here

it should be and now it is

Cosmic Boll

Would it be fitting to put Grapple Dog on here?

Sure, added!

I love this list!

Akai Katana (I think it ties into Radiant Silvergun/Ikaruga?)

Akai Katana is a CAVE game, which to me is another lineage of its own that might merit its own list altogether. Might be good for my Ikaruga-like list?

Sure- I think it's more a thematic connection than a mechanical one: has similar premise to Ikaruga, the Stone-like seems to make an appearance, and the true ending seems to hint at leading to the world of Radiant Silvergun. I read somewhere that Treasure worked on it (couldn't verify that), but the similarities are interesting.