Don’t have enough game engines to choose from already? Well, here’s another one: Pixelwave!
And why yes, you can see there its claim to usefulness, “based on the Flash API”. We’re not interested enough at the moment to figure out how it compares in that regard to the Sparrow framework mentioned earlier, but hey if we ever have to do a Flash port we’ve got a note here to look at it. In the meantime, if “based on the Flash API” is a compelling address of your needs, check it out and let us know how it works for you!