I picked up the gem as part of the Humble Indie Bundle pt. 4. I've put in about 20 hours in and marked off most of the achievements, but I've been playing with keyboard controls this whole time (as I don't have a controller for my Mac). Anybody out there recommend a nice traditional controller to get me off this path to finger arthritis that I'm on? Thanks!

@cwilly: Update: Trying to finish Hell with keyboard controls has left me a beaten and broken man...

I played a little bit. I have a 13" MacBook from 2008 to use when I'm travelling, and it can actually run Cave Story+ without yelling and screaming at me with its fan. But I've only been using the keyboard. :(

I picked it up over Christmas and have been using the revamped xbox360 controller with the improved D-pad. I flippin love the game so far but still can't decide on Original vs. New music/art.

Great game

It shouldn't be that bad with the keyboard. I mean, Cave Story was originally a PC game afterall. It might be a bit easier with a gamepad, but I played Cave Story on PC with the keyboard without many problems.

If I recall correctly, the PS3 controllers play quite nicely with OS X (that's assuming you own a PS3 of course).

I was hanging in there with the keyboard controls as long as I could, but the intricate boosts (while shooting) in The Sacred Grounds bonus level was destroying me. I picked an el-cheapo Steelseries USB controller over the weekend and finally beat Ballos tonight. Not sure if I want to tackle Hard difficulty or not... Regardless, I can't believe I've put in 30+ hours on a Humble Bundle throw-in.

http://www.amazon.com/SteelSeries-Dual-Vibration-Gaming-Controller/dp/B0036WTVNG/ref=sr_1_1?s=videogames&ie=UTF8&qid=1327479257&sr=1-1