Huge Isaac fan so this was a very fun play! It used the theme and prerequisite very well, in many ways it feels like it could be a real Isaac challenge! The items and synergies are really cool, and I love that there are items I really *don't* want to pick up (Wavy bullets my enemy).
Love the concept of a pyromancer snowman melting, and it feels very satisfying to miss a few shots and then pull the run back from the brink by speeding through rooms.
Such a cool project, well done!