Wow! Thank you for your honest review, not many people take the time to write reviews like yours <3. Also, I'm so glad you enjoyed it.
About the assets, no, they are not mine. Most models are from Sketchfab, even though I had to edit or re-texture some of them. However, as you mentioned, I struggled doing the arrangement and lighting, and I'm pretty happy with the results :)
About the blur, that is actually a bug. It seems that Unity's Depth of Field on WebGL increases its intensity the lower your screen resolution is, so each player sees a different amount of blur, even blocking their sight completely when the timer hadn’t even started approaching 0. I'm not really sure about how to fix it, but anyways I discovered it once the jam ended :/
And about your recommendation about the key, you are totally right! Maybe it would be better if I added a UI icon and made the key appear once you are close to the lock, preserving it too for a few seconds when you respawn to make it clear that you kept it. I didn't think about it while programming it but you are right, thanks :)
Again, thank you for the time you took to write this comment. I wish you the best :)