for a first project it's ok

This doesn't feel like a complete experience to me, but it's so not far off -- ten screens of this with different layouts would feel like a full game. Most beginner devs have the opposite problem, of trying to make a game that's too big, so you're actually starting from a good place here.

Polish-wise, the biggest sticking point is that even if you're moving diagonally, you still stop entirely when you hit an obstacle. Most games would have you slide along the edge of the obstacle. Under the hood, the way this is typically accomplished is separating the axes of motion, e.g. move on the X axis, then handle collisions on the X axis, then move on the Y axis, then handle collisions on the Y axis.