As far as flash platformers go, this is one of the better ones I've played. There's a nice mechanic in the dash system and the game is just the right balance in difficulty on Normal (I'll explain why in a minute). The dash controls could use some fine-tuning in keeping mistaken dashes from happening more often, and it'd be nice if there were levels that weren't strictly left-right affairs and had unique objectives and goals set in them as well as offering the combo possibilities the game already has, but a sequel could address that ;).
It would also be nice if there were other hazards besides enemies, like flipping/disappearing platform, teleporters, and the such, just as long as the comboing aspect didn't get too diluted b/c it's very fun in this game.
For those saying the game is too hard on Normal: It's really not. There are two points in the game where u will start racking up way more lives than u ever need. One is in the first two stages, where it's easier to land combos. The other part is in stages 5 and 6, where there are so many enemies waiting to be chained that u can get many extra bonuses w/ no problem whatsoever, if u practiced the dashing mechanic earlier. I wouldn't say expect to beat the game on ur first attempt (it wasn't until my 3rd that I beat it, w/ 11 lives to spare and a full health gauge to boot), but that's a nice old-school charm to it. U learn through failure.
Also, DASH FOR UR LIFE! U can still correct ur landing trajectory after a dash, and u can do multiple dashes in the air of either direction, after about a second's delay. I might've stumbled on a trick where pressing jump as soon as u can technically air dash again will boost u up some to keep u in the air more and elevate u, tho I don't know if that's actually the case (did not need to use that for the l8r stages).