Fellow game designer and 3D artist here. I've been green lit to produce my team's new 2D puzzle/sidescroller. We're new to 2D gamedesign, but not to game development. I have a couple questions that about the possibilities/limitations to Construct 2.
Develop games in your browser. Powerful, performant & highly capable.
Physics are built in with most of the functions you'd want. There is a way to write your own plugins as well if it doesn't have everything you want.
Movie clips I believe I've seen plugins for that but I'm not sure they export to all platforms. I would check the plugins store and forums.
Honestly, this will save you a lot of time even if you don't use it for your final product.