Your opinion of Evoland will really be based on the perspective you take when running it. I think it's much better to think of Evoland as an interactive, semi-guided tour of action/adventure and jRPG gaming history. From this viewpoint, it's really staggering to see how each little bit added along the way advanced and improved video games. For instance, you open up a town, but it's just a bunch of scenery, so you open a chest and it adds NPCs for basic interaction, and then you open a chest for entering buildings, and so on in a step by step fashion (along with some amusing sidelong text commentary from the developers at each unlock, "OMG, Color!"). This kind of approach will likely appeal far more to "older" gamers (i.e. over 30 years old) as we actually experienced and played games that were like the 'stone-age' beginning of this one and we witnessed the evolution over the years that is so well-compacted here.
Looking at Evoland from a gameplay perspective, you will be left wanting. The controls (intentionally at first) at not so great and the camera doesn't help your visual perspective much in the 3D areas when battling enemies. It makes an effort to have Legend of Zelda style action areas and Final Fantasy turn-based battle areas, and these are ok, but the random encounters are far too frequent for my tastes. The actions available are quite limited and the scope is very short and small scale. There is an amusing card game and some collectibles, but they add little to the game itself. You will almost certainly be disappointed if you look at Evoland solely as a game rather than a showcase or demonstration.
A few final comments: there is some really good humor throughout the game. The source material is extensive, though most easily recognized are FFVII and LoZ (your main guy Clink: Cloud/Link). Pick up Evoland if you want to see where console games were and watch how they've grown as it's a wonderful concept that mostly accomplishes its objectives.