Opening the quests window at the wrong time freezes the game, I think. I beat the first enemy and clicked quests to collect the reward, but after playing the animation for collecting it, everything stopped being intractable. Could be tutorial-related; I haven't suffered through the entirety of the message-box-chain yet, probably. Game looked like it would be fun, though.
Your feedback was very helpful! I believe I located the bug, and I have fixed it! Unfortunately I can't push an update until the game jam voting period has ended, but I've got version 0.6 in the works and it'll be ready to push live as soon as the voting is over, and that should fix the issue you had 🙌