I'm putting it on my mantel!
The added challenges in the rooms are a great addition. For the final teleport challenge with the stone tiles room, I think you should have gone a little wider with your camera. I had to purposefully die a few times just to wrap my head around the layout so I could better navigate the space.
But overall, I like all the new additions and that tense boss theme with the cannons is excellent. One little oddity in the slime room is that when these fellas jumped, they would go behind the banner with the mouse directions. I'm not sure if that was intentional. I do also wish my shuriken went through the slimes and destroyed them, that way I could still teleport to it after, or there were times when I thought I was awesome for lining up a double kill with one shot, but my shuriken was destroyed upon impact.
Overall. Great work. I really liked your entry this round.