Well, I'm now expeimenting with Unity and cocos2d-x and also reading about OpenGL
Just asking - how long it can take to develop engine for simple game (lets say for platform game in classic style) and what's tools and starting point?
Here is a pretty good list of android game engines.
If your goal is to make a game go through that list and find the one that is going to make life easiest. If your goal is learning to code then go through and find the one that has the best documentation/code/tutorials.
Time estimate table
(1: Little to no work, 2: A couple of days, 3: A week, 4: Three weeks, 5: Two Months)
Here are a few systems you need to consider when evaluating an engine OR creating one from scratch. Look at each engine you want to use and give it a 1-5 time estimate from that table for getting these systems in:
A) Physics System. This is the bread and butter of all platformers. It needs to be fast, flexible, and easy to edit. You need to get this right because the whole feeling of your game depends on it!
B) Rendering and art pipeline. It needs to at LEAST handle frame by frame animations from a sprite sheet. You need to figure out what your import/export formats are and what tools the artist will use.
C) Level creation pipeline. You will need some level editor that can place objects down with certain sprites/values attached. It needs to export out and your engine needs to read it in.
D) GUI system. You will need a system to handle at LEAST the Screens, dialogs, and basic buttons in the game. You need to figure out what tool the artist will use to place them and how your engine is going to read it in.
E) Sound! You need some way of creating, importing, and playing sound.
F) Player Data. You need some way of saving a players progress.
Developing an engine from scratch for even a simple game can be very time consuming.