I quite like Image Fight, I only wished it wasn't that hard... some of the last stages are just crazy.
By the way, I finished it on an emulator and the game crashed right after the last boss... I don't think I'll ever be able to finish the real game, but if someone does, I'd be interested to know if the problem is coming from the dumped Rom (or the emulator), or from the actual game...
By the way, I've also played the Famicom and original arcade versions. The Famicom game, if not as nice as the PC Engine conversion, is surprisingly really good. And the arcade is *of course*overall much better than those conversions, and easier too I think.