Just played it. I don't know if these are already mentioned, but:
If Curly dies before the game is saved and the player decides to reload, the cutscene plays again. I suggest using a skipflag.
Those yellow drops of acid (?). There are times that they just don't do anything except disappear mid-air. And the third one I found was the lower path, but it wasn't under a block.
There's an invisible block near the two paths. I don't know if it should be there, though.
The cool thing about this mod is that the Save Point is an item. The problem, though, is that the player can save anytime, even when about to die, making an endless loop of dying, reloading, dying, reloading, and so on. In such places, maybe you should move Curly to the start point of that map instead, preventing the loop.