Hi! I have a game idea and it involves a timer countdown, math examples etc. Basic 2D stuff. Would unity3d be the best choice or does someone have a better experience with for example cocos2d?
I think it is quite a simple program and I know there are alot of 2d plugins now for unity. Any suggestions for a lost person? 
pseudo 2d is totally achievable in Unity. You could even use the GUI system if frame rate isn’t an issue. If you know how to use unity or future projects might be in full 3D , go with Unity.
yeah I have some other projects for unity also that is in 3D so I know alot about how to tackle 3D. It is just the 2D stuff I don’t know if it is better to edit in a 3D editor with planes, or using a 2D engine to do some simple stuff. I like unity and javascript compared to alot of other engines
So I also know it is achievable but is it easier? Maybe some says “hey, use the 2Dmathappmaker from XXX” or something 
I would highly recommend EZGUI and Sprite Manager 2 from above and beyond software.
http://www.anbsoft.com/middleware/ezgui/
I’ve been working with it for a week or two and it has solved all of my 2D issues that I’ve had with Unity in the past. It is essentially a GUI library that gives you the ability to build an interface without having to do all the heavy lifting. Very stable and has a ton of features with great support.