Thanks! Yeah, I was thinking of detecting those stuck moments, but what I did was instead to add the "Drill" upgrade (for moving through walls and only give you the R button for restarting. It's in the end a roguelike and I believe it's main feature is to face consequences of your decision :D (But if you wanted to move left and the snake went up instead it is a bug - did you used swipes or keys? I added swipe gestures, but I noticed there are some problems with those :( )
I like your idea of re-using bats very much! :D
I think the snake should be rendered from head to tail to prevent your last pointed out issue and that would solve a problem. I wanted to leave a possibility to move over yourself (but in the end you are moving below yourself xD)