The sprite flickers when you press down and left or down and right, so you will need to set some sort of precedence when moving diagonally, or add a diagonal sprite.
I was also able to move outside the game field, so some collision on the level bounds would be good.
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Hi, thanks for taking your time making a review!
The walls not having a collision is a known issue. I'm not sure why it's this way, because I have put collisions in it.
About the sprite flicking, thanks for pointing it out. Next time I'll try to develop in a way this doesn't happen, so the experience is smoother.