In version 0.4.5, part of the level is locked. We have opened the continuation only in the next version, but it is not yet ready for the web (
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No, you can pass after the fire, but you need to hook onto the wall to do so. We have improved the mechanics in the new versions: you need to jump onto the wall and press the jump key again to hook onto it, then choose the direction of the jump (press and hold right/left) and jump again — repeat for repeated bounces. It sounds complicated, but you have to feel it ^^