This was a cute, little adventure. Bun's expression while holding onto a ledge is adorable and I loved her swimming sprite. I saw you address the spike visibility issue already in your posts so I cannot say much on that.
I suppose I wish this was just a little bit longer because I think something truly fun could come out of this given time, love and care. I hated the controls until I was able to finally bind to a controller. From then on it was very responsive and I never felt like a death was because of the controls themselves but because of my own inattentiveness.
I hope you have the desire to polish this up a bit more, even if it is only on the side. Animations to the large threats (water spout head, snake, worm) would go a long way to breathing even more life into this little gem.