Played it & beat it recently on the SNES console itself. Solid side-scroller with nice graphics.
Graphics: Very polished graphics for the SNES, good sized character sprite, various textures and environments, good use of color, and character design is enjoyable as well. The strong point of this title for sure. 9.0.
Audio: Thinking back, I want to say the sound quality in Skyblazer was mediocre. I mainly recall the title song being upbeat, Asian sounding music that was a little bit intense and annoying. But during gameplay it wasn't quite as abrasive. 6.5.
Difficulty: It's a pretty easy game. If you were locked-in, zoning-out on Skyblazer, you could probably beat the game in about 3 or 4 hours. There's maybe 1 or 2 levels towards the end in which you will die a few times. Jumping up the outside of the spinning tower is challenging, but an experienced gamer would not find it to be hard. To me the difficulty (being on the easy side) did not take away from the overall quality of the game.
Pros: Beautiful graphics for a forgotten old SNES cart.
Cons: Mediocre sound meets basic (albeit solid) gameplay.
Overall: If you like Castlevania or Ninja Gaiden types of games, you will almost assuredly enjoy Skyblazer. Check your bargain bin. It's worth about $9 - $10 online for the cartridge itself, which any real gamer would choose over a ROM. 7.5.