Decided to make the cave color palette purple. Definitely feels more like what I want. Also made the background animated which is a first so far in this game. This about wraps up tile art for Level 2 - "Maynard Falls". Get to start programming new enemies this week!
One note: the animated background is actually an animated sprite. C2 doesn't allow animated tilemaps or tiled backgrounds. So, unfortunately, I'm copying and pasting the same animated sprite. Now I know this is a "no-no" but I *may* be able to get away with it. My resolution is only 256x144, I'm using small images and parallax so I may need to only copy the image 3-4 times per layout. Only an export will truly tell and I don't feel comfortable doing that until I have a whole layout designed. We'll see!