Hi,
I’ve never made a 2d game myself, I don’t know what kind of files and formats developers would want.
I made a brass gear for test. First I attached a file link but it is not accessible for some reason, so I just uploaded couple of sample images.
Are they too big? Are there preferred resolutions? Do unity accept small bundles like 14 items in multiple sizes?
any advice would be appreciated. Thx ahead.
I am getting a 404 error trying to access that link. But as general advice; most people prefer to use .png format for bitmap sprites and textures as it handles transparency and compresses well. In terms of preferred resolutions making your sprite sheet or texture image a power of two is generally a good idea, so 32x32, 64x64, etc all the way up to 2048x2048. Anything larger than that is generally not used in games however. In terms of asset bundles, I have heard that small packages are often not accepted but if you do get accepted it is always great if an asset has a greyscale version that can be coloured via a tint colour in the material within unity. Its always nice having easy, programmatic access to pallet swaps like that.
thx for reply, Yeah I do get that error too… strange, maybe the server has blocked outside access.
I deleted link and attached some samples, but after reading what you’ve wrote, I think I really don’t understand what 2d game making is.
I made 2d things in random sizes, too simple bundle, not editable… I should study much more before trying to upload anything.
thx again your answer helped a lot.
Hi
Just saw your post and thought i would see if i could help you.
I wrote a book on creating 2d art for games its on amazon and iBooks links below. However feel free to pm me with any of your questions, i would love help, even if your not interested in my book 
http://www.amazon.co.uk/gp/product/B0179YKBJE?*Version*=1&*entries*=0
http://itunes.apple.com/us/book/id1052808900
Regards
Declan