Your Characters hitbox shouldn't be quite as tall I think, so you can walk in front of the Walls a bit. Also some sliding along Edges could be nice, so you don't have to align so perfectly.
Your Character is cute, but a clearer Edge between Wall and Floor might be useful, in case you decide to have more Variation in Floor/Wall Types, so it doesn't merge into each other. Not an Issue right now, but maybe something to keep in Mind.
Apart from that, theres nothing really there yet, but it seems to be Bugfree.