This WIP has a version of 4-4 and the glitch setup:
http://dehacked.2y.net/microstorage.php/info/830458799/Croctopus-Chase-TESTRUN.smv
Here is a test of the level only, that Arne made awhile ago, which is far from optimised, but shows beating the level:
http://dehacked.2y.net/microstorage.php/info/958603710/Croctopuschase-glitch-doublecheck2.smv
There have also been a few finished version in Japanese TASes which you can find on Nicovideo, and I believe in this topic too. None of which are completely optimised to my eyes.
It is also possible, as seen in the JP runs, to do this with Expresso. Some testing long ago by Arne showed that Expresso was slower, but more in-depth testing has to be done for the entire level to make sure.
Now for the problems to TAS like this: The camera. The camera is set at a very slow pace, which means you outrun it quickly. In order to beat the level the camera has to be close enough for the exit to spawn. Once the exit is spawned you can finish the level anywhere on the right side.
As Diddy is moving too quickly, the camera will have a hard time catching up. And it will keep getting stuck because it mainly follows the "intended" path in the level. Sometimes, which I have yet to understand, the camera will speed up quickly and through all obstacles up to (Or close to, rather) where Diddy is. The first SMV is fairly optimised up to a point when Arne couldn't get the camera to keep following, which is where we gave up.
Another issue is the enemies. When recording, a camera hack is practically a must. I can upload Arne's tutorial on how to use it. But that means that the hack will show enemies where Diddy is that have yet not been spawned by the real camera. So while you are recording, they will be in your way even thogh when replaying, you can go through them. They can also cause the game to lag when recording, which does not happen when replaying. And enemies on the real camera can cause lag when replaying as well, causing it to desync for that reason too.
So those issues combined make this level a huge pain to work with...