Brief and enjoyable experience. I enjoyed the animations of the main player quite a bit, nice work with that. I have some feelings about the level design though:
1. The acrobatics aspect was very neat (though seemingly unrelated to the game). I felt like it required a bit too long of a spinup time for me to enjoy using frequently. I used it when I had to.
2. I'd frequently fall to my death since I could not see beneath me :(
3. I found the gas caves and the game put a checkpoint down there for me. This meant that every time I was trying to climb back out I kept respawning down there and I was sad...
4. I found the flashlight + helmet before I knew I was even looking for them! Would be nice to force the player's discovery order of "Oh this place is dark, if only I had a helmet with a flashlight!"
5. The final boss / flood sequence was fun! My only feedback here is that the final enemy's motion pattern phase was RUTHLESS. If you were not way ahead of schedule, you were effectively guaranteed to be slowed down and die because of that final enemy. Consider removing it completely or make it move faster or something of the sort. There's a balance between "Fun because challenging" and "Annoying because unintentionally challenging" :p It seemed like the two paths to reach the top changed the phase of the enemy because they had different path lengths. One of the paths would always put the enemy in the wrong phase!
That's all I've got. Nice work with this little piece :)