Very challenging, addictive, fairly amusing -- 5/5. If this ever gets badges you would want goals for less than x parts/time used on individual levels, or sets of levels, etc. You're tracking this info in-game, but if you're also using the Kong API you should make it visible (not just the one highscore).
For that matter: don't wait for badges! Add in-game achievements like the above to give players additional goals to shoot for, and feedback on how good their solutions are.
@Everyone asking about basic game mechanics, or where/how to begin:
There's a wiki out there that is pretty decent . It answers nearly all of the FAQs and has a several tips scattered about.
@Everyone posting strategies and tips:
I think the wiki could use more of these, and it definitely needs more activity on the discussion pages. Go generate some! :)