I quite like it. It reminds me of Metroid 2 with the sense of humor of the Binding of Isaac guy. I really wish I didn't have to hold down run for the entire game. May it's different on a controller, but on the keyboard, my index finger is cramped. (and I have seen no reason to walk once you get run, so why not just increase our speed?)
But yeah, great game reminds me of the sorts of treats you'd get in the Kongregate days.