It seems that some of us had the same reaction.
I didn’t sleep for 2days to complete 3 sprite pack, I submitted all of them early, and after my first file soft rejected, I prepared 2 different packs again. but I didn’t submit them. I thought if I do that, some of the designers that didn’t see the announcement in time, even can’t start their projects.
So I only have 2 files here!
What exactly does a minimum of 30 sprites mean? Does it mean we to animate 30 characters or the character has to have 40 different frames or we need to create 30 different items?
Please Note: All entries need a minimum of 30 sprites, either for one character, multiple characters, or a complete game scene/theme!
I think, there must be at least 30 different sprites, your design may have only one character, but in 30 different positions or 30 different characters, only in one position and everything between.
For example, for a tower defense game, you can design 4 or more different positions for a single tower. Or for a combat game, you may have 3 different characters and 10 different positions for each one (Ex. standing, walking, running, jumping & Etc)!
(That’s my opinion, for a complete answer, you must ask the moderator!)
In my opinion, there is no exact size or even limit for size of sprite!
Nowadays, we have FullHD smartphones & tablets, so I think even 256×256 can be useful for today games. but I would rather to use 128×128 for each item.
Also I think gradients can be used for sprite sheets. besides, it’s not mentioned that the files should be 2d or 8-bit or 16-bit! so we have freedom to choose pixel art or more complex items!