Personally, playing "I'm not touching you!" with the bullets for multiplier had quite a charm to it. I'll miss the hack translation though.
This signature is dedicated to all those
cyberpunks who fight against injustice
and corruption every day of their lives
Seconded! Torus Trooper is quite a rush, though most of his other games are somewhat derivative... rRootage even lets you choose to play the game in Ikaruga, Psyvariar, or Giga Wing mode! All his stuff ends up being amazing though, so it's hard to criticize.
If you like Kenta Cho's stuff, you might also want to look into "Hello World Project"... they make similarly abstract shooters. This is the best english page I could find. I've only tried Area 2048 and Z-Lock so far, but I thought they were both excellent.
--Zero