I played all 3 episodes, start to finish, probably more than two decades ago. Since then, replayed some parts a couple of times, but I am not sure I ever finished the third game since.
The soundtrack is one of the nicest things about the Jill Trilogy, and the mechanics of playing as different animals is rather original.
Control-wise, choppy is a good way to put it – it is very much grid-locked – unlike the very smooth, sometimes pixel-resolution platforming of games like Commander Keen. However, I found that once I adjusted to that, the game was quite fun.