The artwork is consistent. I like the puzzle mechanics. I think there could have been some minor tweaks to player movement. I personally prefer spacebar to my jump, but i feels like you wanted all input to be handled using only WASD. Nice work!
And yeah, wanted the game to be extremely easy to pick up, without any tutorials or control schemes. In hindsight, I probably should've allowed the player to jump both on space and on W/Up Arrow.
