Thank you so much for playing! Happy to confirm that yes by design there are a few routes through the game! Most players will get Wood -> Ice -> Gyro -> get lost for awhile (oops) -> Glass, but you can actually immediately get Gyro once you get Wood, and then there's an alternative way into Caldera to get Ice and then Glass.
There are definitely a few softlocks some I missed and I'm always thankful for folks pointing them out - I'm happy so far all softlocks have been fixable by quitting to title and loading back in...earlier there were a few where if you hit a checkpoint your entire save file was permanently doomed. Definitely a hazard with this style of game that requires more playtesting than I had time for (the entirety of Vault was created with about 3 hours to go before the jam closed)
A checkpoint reset button would have helped! But I was a little worried you could break things by teleporting back (last checkpoint is underwater -> freeze surface -> teleport back down to checkpoint)...lots to think about.
I hope to take this general concept and kinda re-evaluate the world design and overall progression in the future since I really love the concept - I'm glad even this version with some level design quibbles was still fundamentally an interesting time!