Thanks for replies ! I toned and changed colours of cave :)

Man, that looks awesome! 

i have prototype right now, www.youtube.com/watch

Then what are you waiting for? Go! ;)

I would love this to be a game one day.

@rocifier  I thought about it. But this location is deep underground, so I rather sticked with darker colours.

Will this be a game? Wondering if I could help in any way ;)

Anyway, here are some crits:

Nice stuff! Maybe spice up the tileset, since the middle is quite empty ;)

Those rocky effects are really good and those spikes are really scary (seems instant death for me). 

I liked the use of the colors. <3

It's a good start but it feels too simple and unfinished. Perhaps add an enemy. Also there are some issues with the background pillars having the same value as the foreground. They should probably be lighter as they recede into the distance. The pillars also lack elegant design, and just seem a bit random and blobby instead of being something structural.