I thought it was alright but the controls were a little bit slow; I wish the character moved faster. Also it'd be great if we could jump and shoot the gun at the same time. The environment wasn't very intuitive at times as well; for instance it wasn't always clear if I could jump on something or not.
That said the levels were rather well-designed and the enemies provided the right amount of challenge.
It definitely has the potential to be a great game with some improvements!