This is extremely difficult, but not so hard that you can't beat in 30-60 minutes. I thought the controls were spot-on. This game reminds me a lot of Megaman for the NES. (Some of those platform levels were near impossible!)
Although this was extremely challenging, it was also very fun and addictive. I couldn't bring myself to walk away from my computer until I got all those God forsaken orbs!
The graphics are crisp and simple which I think works perfect for a game such as this. However, I have to agree with previous posters in that It needs a soundtrack.
All-in-all, I hope you make a sequel. Wish I would've gotten the secret medal, but oh wells.