If you watch the first two episodes of "Milo Murphy's Law" -- currently available for free through the folks at AMAZON PRIME -- and one of your first thoughts is is that it looks and sounds and feels a whole lot like "Phineas and Ferb," you are correct. Jeff 'Swampy' Marsh and Dan Povenmire are the creative forces behind both shows, and the artistic and humoristic DNA is the absolute same, basically. (Except this one also has Weird Al Yankovic. So...there's that.)
I'm not sure how long the price will remain right, so you might want to check 'em out sooner rather than later. (On a personal note, Nathan has already watched "Going the Extra Milo" and "The Undergrounders" about a million times. Good thing they seem genuinely funny.)
Or, you could just watch it here.