Hey nice game! Was able to get through the first level :) I initially thought I just needed to collect the objects (apple, can, etc.) because they stood out and the blue dots blended into the dotted background for me. So I might suggest changing the blue dot points to stand out a bit more or to match the look/feel of the other pixel objects.
Otherwise, I enjoyed your first level. The controls felt nice and I enjoyed the sound effects and the background music too :) Good work!