The concept of filling the room with new challenges is really interesting, and I’d say the level design as a whole is very well thought out. The difficulty curve progressed in a satisfying way, as it not only brought familiarity but also introduced new elements, which kept the engagement steady.
I really enjoy exploring menus, and without meaning to, I ended up clicking on the option with the most levels first haha. Some of them are insanely difficult, but in the beginner mode, I was able to get through it easily.
The controls are very responsive, and I’d say the feedback is great, especially the squash and stretch effect. To take it even further, maybe some small dust particles could be added at moments of impact or even a speed line during the dash—this would really enhance the experience.
For something made in just 16 hours, I’d say you really did a fantastic job, congratulations on that. I wish you the best of luck in the jam—it's a very fun and challenging game!
P.S. I forgot to mention earlier, but a small square or explanatory text appearing when hovering over options, before clicking on them, briefly explaining what each option is, would be really helpful in informing the player about what they’re about to do. It might not have much impact in the current form of the game, but it would be a great addition for future projects.