I understand this is a test version, but I will give suggestions as if it were a near-finished product, just in case you've missed something in your planning. I recommend adding sounds (sound upon death, sound upon reaching goal, possibly music) and an in-game explanation or more in-depth explanation in the description of what each color block is. It may have taken me a few seconds to figure out that the blue block was the player, but I didn't figure out the red block was an obstacle (or that it would kill me) until I tested it. I also wasn't sure what the green block was until I moved into it. Other suggestions I have are more levels, boundaries around the maps so that the player doesn't accidentally fall off (or make that part of the challenge in some levels, with blocks pushing the player off the edge). I look forward to seeing what you can do with this game in future.