depends on what you want. I'm still trying to find a functional version of budapest defenders.

That being said, If you like twitch-reaction games, I can't recommend any of the robot unicorn attack games enough (at least the ones released on the website before being ported to mobile)

I actually bought the first one when it made it to android, and make a point of hunting down the apk whenever I get a new phone, lol.

edit: add the old "Pengu" games to that list. Also newgrounds has a front-end for their old flash stuff

oh, and if you dig around a little bit, you can usually find the "adobe flash projector," which was a standalone player they released for "debugging" purposes.