I like the idea of constantly being tossed into different levels with different abilities. Nice job! :) Having two spells per level is also a neat touch. It felt nice to mix 'n' match them as I went.
The things that confused me were the gold rings. Firstly, it's not entirely clear if they're collected automatically or not, and secondly, I am not sure if there was a shop where you could spend those rings? Do they simply affect the chance of getting buffs of a higher tier?
Apart from that, I'd like to see more different upgrades and variety in general, but we all know how game jams go. :D Good job and all hail the big baby!