If you spawn 4 fruit on one tile the game crashes, I think. On level 3 with a score of 502 I killed a slime on a spot with two pears and it dropped one pear and the game never went to a state where I could walk.
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I tried to recreate the scenario you saw by making all enemies drop four items every time and was unable to recreate the issue. I did see an issue where you could erroneously move in between turns and after the game ends. That's included in the release I just posted, so hopefully it resolves it. Either way I will keep looking out for it. Thanks again for the report!