Someone else already pointed out a lot of the problems that I experience in my first playthrough, but I've got some things to address that have to do with the changes:
- After beating the game and pressing the play button again, it took me back to the last check point. What should I do if I want to play the game from the beginning? You should probably put in a popup box that asks "Would you take to continue your previous game?"
- Following up from the last one, after pressing the play button and making my way to the boss, I found its inner legs and fangs were gone; they had shifted over to the right side of the boss area). After I died and came back, they were back to normal.
- Is there supposed to be a wall on the far right side? I managed to scale the right leg and make it there to be greeted by an invisible wall. Though a bigger problem is that it is possible to scale the far left leg and leave the boss battle without any way of getting back in to fight other than killing yourself to reset the stage.
- the boss is very underwhelming now that you've reduced the poison spray's spread and reach (though I will say that the spread was definitely way too much before. Making it a little bigger would make for more of a challenge to dodge, just not as large as you originally had it). The beast only has two attacks going for it anyway, the other being to stomp on the player. I'd suggest adding one or two secondary attacks, like icicles growing on and falling from its limbs, or ice spikes coming out of the ground.
- You've taken a lot of spikes off the walls, which I feel wasn't necessary. One of the walls was pretty tough, but not impossible to climb.
The main problem overall is that more is needed than fixes to what is currently there. I can't see anyway to make the boss decently challenging without making it unfair or impossible. There is little to no strategy needed in battling it, no "waiting for the right moment", no build up or changes in combat, and the most difficult part of it was standing on the beast since like the guy two comments below me pointed out about the edge clipping. I wish I could put it in words better.
Still, from your description, it sounds like you are going to do more with this and I really hope so. Do you need support for its development. Putting a link in the game could get you that. I really would like to see this expanded as there were parts that I liked, it just needs more added to it, more functions both in enemy combat and acrobatics. I wish you luck on your future gaming projects.