Can't jump after respawning, when you fix it I'll try it again.
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Hey there!
Sorry about that, I just pushed a fix for this issue. On the player controller, I check to see if the player has selected some UI elements to prevent jumping (this came about with the update notifier introduced in 0.5.0), and I forgot to deselect the UI elements when the pause menu is hidden.
Updating to v0.5.1 should fix that issue for you. Sorry again!