Although a short game, it's a very good game. There is not much story to speak of, but it isn't necessarily the most important part of this kind of game - the title describes the objective, and a counter in the bottom right hand corner describes the win condition.
It's easy to see where the developer has gotten his inspiration from (among others VVVVVV and Super Meat Boy (and, while I'm not quite sure as it might have gotten inspiration from the same sources, I might want to add I Wanna Be The Guy to the list, too).
The game is hard for pretty much the same reasons VVVVVV is hard - it's difficult to remember how to get where, and it's easy to get lost in the numerous level screens. Some parts of the game requires some "grinding" (if that's an appropriate term to use for trying again and again in a platformer), and some levels are pretty boring to do after a while. But the save-points are plentiful, and collection of money/artifacts/things are saved upon collection.
All in all, a really good game. It took me 1 hour and 50 minutes to get to the end without losing, and completing the game 100% took me 2 hours and 10 minutes (that means 20 minutes extra from my first, any%, win to my second, 100%, win. After this, I have three achievements left, which I'm going to go finish pretty soon. Other than getting 100% of the achievements, it doesn't look like there is a lot of replayability, as much of what makes the game great is the exploration. However, it could be a fun game to run through once in a while, just to see if you remember every level and how to do them.
If you like this game, I'd recommend also checking out VVVVVV, Eversion, and I Wanna Be The Guy. This game reminded me a lot of those three, and I have enjoyed all three of them a lot, just like I did with this one.