I actually really liked your interpretation of the theme! Rolling in one direction and having your direction be a key part of strategy was really interesting - I think I would have liked it if you rolled until you hit a wall, because I had difficulty getting to far away enemies. I'm a fan of the menu Mr. Avacado :)
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It is true there should have been walls for the player aswell, there are cards that let you attack from a distance and reverse your roll direction however the game usually crashes when the end of wave screen (which let's you add cards to your deck) pops up. Thank you for your comment, after the jam I will release a fix for the constant crashing hopefully.