I appreciate that WASD and arrow keys are both valid forms of input. This is good.
Great tile artwork. The bricks look really good.
Not a bad start, though I have some CC: Needing to collect a bunch of things before you can complete the level means you've started with nothing and ended with everything which would be more the opposite of the theme. Overall it has a feel of doing tasks rather than playing a game. That is to say: where's the fun? Maybe adding enemies could help. Something to make the task of getting the keys feel more interesting, you know? Keep it up. I believe this could end up being fairly fun with the right attention paid to it :)