The Arena should automatically move to the next wave after about 3 minutes, to avoid softlocking your game. I'm still adjusting the arena wall placements as well! They were fixed late in this update's development cycle, but hopefully I'll have that all fixed soon. Thank you for your bug report! I'm glad you're enjoying this update :)
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There is a proposal to hang a visible timer in the arena with a countdown of these three minutes, so that the player understands that the process is in progress, and does not wonder whether the game has frozen or not. :) It's psychologically more comfortable. And if something goes wrong, you wait for the timer to end rather than restarting the level. :)