Here is my suggestion:

- forum.png (25.49 KiB) Viewed 6851 times
I changed:
- replaced texture by a simpler one
- slightly corrected the to3d-function that draws the cube
- added shading
The most important one is the shading. I did this by dividing the r,g,b values of the blocks by 2 (or any other number). Black has the color (0,0,0). By dividing r,g,b by 2 I mix the previous color half and half with black. The same goes for the other faces, there I multiplied with 0.75, which is a 1:3 mixture with black.
One small comment on the shearing: You forgot to divide by 2 in some places. I suggest you compare my love-file to your original one.
Two more suggestions:
- Remove the transparency effect. It is a bit confusing.
- Add a shadow right under the player. That makes it easier to determine, where the player is.
Edit: I forgot: Nice work so far. Keep going.