Since I was a little late to the party before I thought I'd Just try to move things around a bit and see what happens.

im trying to imagine these tiles used to make walls in a shooter since they don't seem to have any structure to them.
they look like rocks at the bottom that would just fall apart if not supported.
seems more appropriate to make some structural rocks with coral or something along the lines of Xenon 2:

OMG! this was my favorite game as a little kid, I never managed to find it as I didn't know its name, so thanks a million :

My idea for the game is having the player being able to scroll sideways indefinitely until he hits the a rock wall while having rock obstacles shapes and/or mazes in the middle to keep it interesting,(it works well in my head but I guess I'll just have to see how it works ingame)
I'm currently working on more edge shapes. If you have any input on the idea please let me know .

Maybe let his finger stay there a bit more after the drag.

Just played with the palette a bit.

I don't believe you that it's not photographic/reduced actually, but whatever. You seem to have pixel level control on these, so good on you.

I guess I should take that as a compliment .It took me a lot of time to make it tile this way, if it was a reduced picture there is no way it would tile this way, you can play with the tiles if you want. This was my reference at first in case you were wondering.
Spoiler
and if you try to reduce this picture it turns out much less blurry, I acually tried to make my tiles more crisp but it looked jaggy, you can also see a few of my Wips in comments I made before.
this is my first attempt at making tiles by the way, from the green-purple one to this, it took me about a month (I have other obligations so I didn't do it all the time obviousely).