It is a minimalistic platformer with pretty good controls and nice music. That is everything a good platformer needs.
The difficulty is good, I played a lot of other platformers and i could just barely finish the game with 10 lives left of the initial 100 lives that you get on normal mode. There are a couple of "leap of faiths" in the game but generally the game is pretty fair especially nice is that the timing puzzles (megaman blocks) have a visual clue.
The game is rather short, i finished the game in 1324 seconds that is about 22 minutes. There are some achievements and secrets but i think the replay value is rather low, there is a mode with infinite lives, and a mode with just 1 life as well as a speedrun mode but i think they all play on the same set of levels.
Maybe not a game i would buy at full price because it is so short but if you like platformers and the game is on sale go for it.