It is a good game, but not remarkable.
This game is a linear action-platformer in a 2D plane with 3D graphics. Your character can walk, run, slide, jump, double-jump, wall-jump, climb walls and even hang and move on ceilings. This variety of movements opens up to a lot of exploration in the levels, and such exploration is rewarded with lots of in-game money and hidden collectibles. The in-game money can be used to buy upgrades and costumes.
The levels are huge, with plenty of side-corridors or side-paths where you can find items. Since I wanted to explore every inch of each level, I often got tired before reaching the end. Slightly shorter levels (i.e. splitting each level into two) would be good.
The combat has a fast short-range attack (which you will end up using almost all the time) and a long-range attack, as well as a couple of gimmicks (left-trigger + short attack, or right-trigger on top of an enemy) that are a harder to pull off, and slow down the action as the camera freezes in a bullet-time fashion. This kind of effect gets old very quickly and breaks the flow of action.
The character has a stamina meter (for stuff such as running) and a health meter. The health regenerates when not taking damage.
Due to the amount of buttons used (4 buttons and the 2 triggers used as digital input), it might be a bit cumbersome to play on keyboard. I can't say about it, because I used a controller.
Although each level is huge, the game is a bit short, as this was meant to be the first episode in a multi-episode saga. And the storytelling in this game is not very good, I had the impression the levels did not follow any logical order, I haven't seen connection between most levels. (For comparison, "Sonic 3" storytelling is perfect!)
Overall, this game is okay. Between "Yes!" and "No!" I give this game a "Meh".