For your first project, it looks great. No cutoffs in the screenshots, great enemy placement, no spam... all these tell me this project has a high chance of succeeding. Keep it up!
That looks great! Only problem is that in the castle screenshot, the green Background Castle blocks (The ones behind the twomp) blend in with the Foreground blocks, try making the background blocks a little darker! Other than that, this looks like a really fun episode, good job with it!