Love this. Contrary to below, I actually prefer the tongue controls as they are - feels reminiscent of other games that use the controls as the main challenge, like I Am Bread or Octodad. I wish flies either spawned more often or gave more fullness, just to facilitate higher scores, but overall I really enjoy the game.
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I'm glad you enjoyed it! Silly controls in games like the ones you mentioned were definitely an inspiration. I made the flies not restore too much stomach meter so that the game would have more a time-limited feeling to it. I also didn't want the game to wear out it's welcome as it's quite simple and silly.