I wasn't that impressed by this. It's mostly because it just isn't well detailed and you're going through the same area over and over. That being said, I did appreciate it for its simplicity. You didn't seem to want to make anything flashy. The sound effects are pretty good too. I thought it would be impossible for me to pick up one of those green things, but it wasn't that hard. It just gets redundant after awhile.
There could just be better colors used. It's harmless for what it is, just not something that I would really recommend. It is kind of unique in its execution. I have played games like this before, but not ones like this recently. I also wish that you could get rid of the penalty for pausing.