Overall, pretty decent. As someone said, it’s nothing that makes me say “oh my goodness, I’ve got to play that again!”, but it was entertaining enough to keep me around long enough to finish it. My only real complaints were the palette used on the ice world and the lack of any real level in the castle. The palette in the ice world make certain things (like munchers) difficult to see at times (among some other things), and I just felt a little disappointed when the final level was just the boss fight.
Other than that, it was as advertised - 8 levels and pretty easy. Each level had a theme, and that allowed me to enjoy the game a little more. If that’s what you were going for, you nailed it. I enjoyed myself for a decent 20-30 minutes, which is exactly what I needed.