I don't know of any flash based games of it yet, but I do have a copy of lumines, and it is addicting. I have 2 other games for the PSP, and I really haven't played those yet, because of lumines. It also doesn't use up the battery. You can get at least 5 hours of gaming with lumines. Get it. You won't be dissapointed.
I don't have a PSP, just wanted to try out Lumines, basically. PSP isn't practical for me -- no down time where a portable game system would come in handy. Just interested in playing Lumines for a little bit.