So, I played it for about fifteen minutes and think I have a few things to say about it. I'll start with the bad stuff.

Firstly, the control scheme is... poor. Clicking lots of buttons at high speed is down-right clunky and frustrating. This is the process when I try to play: First I look at the game to see which is the next color; then I look up to see where that button is; Then I move my mouse; Then I click; This is too much effort just to change the color, and it is hard to do this quickly enough on later levels. I think using the keyboard (perhaps the number keys) would be much better.

And while I'm on the subject of color, I think that you should have chosen something other than purple. It looks too similar to blue. It should be changed to something more unique. Furthermore, the shapes in the middle of the color blocks should be darker. As it stands they are kind of hard to distinguish.

Now the good stuff. I think it's a nice use of the runner-style genre. The graphics are pretty cute, if perhaps a little basic. The music is generic but decent enough.

Overall I would say it is a decent game, that could be improved vastly with some simple changes. I also think that perhaps the concept could be explored more, perhaps with more varied levels and the like.

Anyway, I hope this is useful to you :)

A nice idea, but with a very limited implementation. The core gameplay is reasonably fun, but it gets boring awfully quickly. The art is basic, which is fine, but it would be nice if there was more variety in the enemies and background tiles.

Also, it lacks "juice". A way to improve this would be to add some blood splatters and perhaps persistent bodies, and maybe some screen-shake when you fire your turret.

Another little nit-pick I would give is that the score font is really not suitable. If you are going to have a pixel-art style game, the font should be pixel-art too, otherwise it just does not look right.

I realize that these may seem like very small things, but making a good game requires a lot of small tweaks. All these little things add up to make the game feel a lot more fun to play.

As a side note, I think this would be a really good game for mobile devices. The one-button input seems ideal.

Anyways, hope these criticisms are useful to you. Good luck with future game deving!

An interesting (although not original) concept, executed extremely poorly. It just isn't fun to play.

For starters, the mechanics aren't particularly tight, and your character runs really slowly, making the necessary retracing of steps an absolute chore. The difficulty is stupidly hard in the worst kind of way. It's just trial and error, with no skill, which is not at all fun. Throw on top of that the fact that you then have to retrace your steps, and it's just salt in the wound.

The graphics are also pretty damn bad. I wouldn't necessarily mind that, but there is some inexcusable stuff. Text is often unaligned, for example. That's just laziness.

The music is okay I guess. That is probably the only redeeming factor. But this is a game, so that ain't enough.