Triad Stone...
I quite like it Clash. The game is basically an obstacle course. Meaning do the right thing at the right time, or you are dead. If you like stuff like Splatterhouse, you'll probably like it. The best part of the game is atmosphere, it's amazingly well done, the boss fights are all unique and very satisfying to fight against. It's also nice having a Vectrex game that actually has real levels and a true end. Most just loop forever like the old arcade days...