Thank you very much for the review!
I found out about the dizziness issue a little too late in the development, too, haha. The issue is noted; I will try to rebalance activity progression so that the player won't stay too long at a time inside the staircase. The rebalancing with both enemies and a completely revamped item system is definitely on the list, too!
(I actually have a "hard" version that I quickly rebalanced before the extended deadline in the Windows V1.0.0 version; the WebGL version was the pre-rebalanced V0.8.9 one. If you want to try a harder variant, please feel free! Though I would admit I overcorrected a bit, and I believed it was a little too hard, hence why I moved the easy version up in the WebGL.)
Finally, I genuinely appreciate your compliment on the aesthetic! I love Killer7's aesthetic, so I'm glad it oozed out in this work.