Get this and AngelRush now.

This is easily the deepest "90s-style" vertical shooter you can buy, straight from Asia. Enemy and bullet patterns are amazingly well coded, where all the US/EU-developed games fail. Add highly original gameplay systems, pinpoint control, and great chiptunes, and you have a must-buy game for the hardcore fan. Amazing job.

rotstik about HotField (Bullets time shooting game)