HELLO.
I am not in this group but I told Turkey that I could help too.
So first- my english is not very good, but I think that one of the best drawings made Turkeyonastick, dude you are making great things.
But I like many other art works too.
About ideas- I think the cell level should be colored, but not very much, because It could be better if it is gone be just with some colors or light colors like- white, light brown, red and other.
If this game will have many colors, it is gone be hard to understand.
Here is drawings what I made for cell level (enemies and obstacles)
CELL LEVEL DRAWINGS
1- Just and enemy, moves slowly and attacks with her hands.
2- Enemy, moves slowly and shot some parasitic shots, slows down player.
3- Moves normal, and it can poison player.
4-These are turrets, one shots every 1-2 sec some number of cells and second shoots out splats and parasites player.
5-One of the first enemies, not very strong, it can shoot.
6-Big enemy, moves very slow and it shots 5 bullets to different positions and it is hard to kill.
7-Some obstacles, include some medical, or bullets inside them or just can use them like blocks.
8-Enemy, moves to different positions and shoots out many bacteries( 5-8 ) , but it is easy to kill.
I hope you like it :)
Good luck cell team !