This kit is awesome !!
Started making a Metroidvania with my friend, had lots of useless events, didn't even know you could make 1 massive world filled with rooms, didn't know anything about how to truly us Functions. Hell, I even learned a lot about something as basic as use of layers and variables xD
When I checked the kit I understood I basically knew nothing, so I made / copied the entire kit from scratch to absolutely understand what everything does. If you're new I recommend to this too ! You'll learn a lot
So what it comes down to: if you're new to C2 / making games ( regardless if you want to make a Metroidvania or not), just buy it if you're serious about it. You will learn more than you could just browsing forums and opening a capx example here and there.
As for most features that were requested, as Tokinsom said it's really easy to implement. When you understand the way it's all set up, you can play around with it and expand easily on the base kit. Because of this kit our game looks great now, is coded efficiently, the list of positive things goes on and on.
Thanks to Tokinsom for making this kit & for being so active and helping on forums !