Tygrin's Sprites [WIP]

Hey I just joined and made an intro thread! I was hoping someone could critique the stuff I been working on lately. I have done some stuff years ago and picked it up a month or so again, it's hard to start doing stuff but I am trying my best and really want to get better because I enjoy it a lot.
  space walk animated gif.gif (Size: 16.95 KB / Downloads: 57)
  space run animated gif 2 alt.gif (Size: 13.18 KB / Downloads: 56)
  space jump animated gif long.gif (Size: 19.87 KB / Downloads: 56)
  driller formation animated gif.gif (Size: 30.54 KB / Downloads: 56)
  driller deformation animated gif.gif (Size: 30.54 KB / Downloads: 56)
  driller walk heavy animated gif.gif (Size: 10.87 KB / Downloads: 56)
  driller drill animated gif.gif (Size: 13.23 KB / Downloads: 56)
  spriteBeetleFungus1.PNG (Size: 3.79 KB / Downloads: 56)
  spriteVioSporeFlower1.PNG (Size: 5 KB / Downloads: 1)

Sorry if I put too many on here, should I do one at a time next time? These are all made up for a friend and I's potential game for practice.

Edit: So yeah, any feedback whether it be the overall design, movement, color scheme, shading(which i'm awful at) is much appreciated! I have a lot more sprites and can even post my sheets here.

Edit 2: I guess i'll point out things I need help with too while I make this starter post. I think the grass is just okay, not sure what to do about the dirt if I should make it less "pebbly" or what.
  tileGrass2.PNG (Size: 656 bytes / Downloads: 26)
  tileDirt1.PNG (Size: 410 bytes / Downloads: 26)  My rock looks off too
  spriteStoneLarge1.PNG (Size: 3.38 KB / Downloads: 26)

Alternate color scheme of tiles put together with a sky, as I said before not sure what to do about the dirt, too distracting?
  whateverz.PNG (Size: 43.44 KB / Downloads: 4)

Also a major thing, since the game my friend and I are working on atm has physics where you can rotate objects, should I individually animate each rotation or just let the programming take over? Is there an easier way to get the lighting all on the appropriate location without having to animate it by hand? I want the physics to feel pretty smooth.


Anyway, thanks!