I really liked this one, Especially the idea of creating a checkpoint whilst standing still, which adds a bit of risk to making checkpoints as each ones wastes a little bit of time.
The only thing I didn't like was that it was super easy to accidentally change into a bat at times where you didn't want to, and doing so could make you instantly fail. I think this was mainly due to it being on the same button as jump, occasionally I'd try and wall jump and accidentally turn into a bat meaning I couldn't wall jump any longer and I'd slide down the wall
Overall though, great art style, and a really interesting concept that definitely has potential to be developed further if you wanted to