Cool game!
It was very easy to understand but hard to master. Sometimes the game would not let me place one down even though it should have let me. Maybe i just clicked badly or something. Other than that a solid puzzle game!

That's a really cool game and take on the theme! I really like that you reversed the theme a bit - you are not preventing the space from running out, you are the one causing it. It was fun figuring out the puzzles, although sounds were a bit annoying.

Also thanks for making the game playable in browser!

Fantastic. I tried playing a few games that were for standalone, and I was having issues running them, even as administrator. As @moczan said, thank you for making it playable online! The graphics were sharp, clean, and simple. The audio was to the point, and most important of all it was spot on with the theme. You can play my game here: https://ldjam.com/events/ludum-dare/42/countdown

Very cool! Seems like sometimes I could cheat a little though. It would allow me to put blocks on top of blocks that already were green. They wouldn't snap back to the side and I'm assuming the code just says "there are not more pieces left to play, so you win". Other than that, very nice! As I played through it ignoring that cheat, I found myself really scratching my head on the last puzzle but finally managed it.

Neat idea! Placing blocks didn't always work for me either and sometimes they would just disappear (by placing them on other blocks).

nice game i really like the concept of the puzzles.

Fantastic puzzle game. I would love to see more levels!

The puzzle is very original, and turns out to be interesting to play.

Would be a good game if we can play it with touching screen (like iPad)

this is a really neat puzzle mechanic, i really like how it plays. you could build a ton off this simple idea, not that it needs it. I found the click-dragging mechanic a little annoying, especially since sometimes pieces will be rejected even if the icon is in the right square, just because the cursor is not directly in the center. other than that i enjoyed it :) nice job

That's a very clever little puzzle game :) ! Well done !! I really like the sound effects and simple animations, all in all it feels great !

I'm kinda disappointed by the small amount of levels as this is exactly the type of puzzle game i love to play when i try to waste my time. The game itself is really fun and if you update it with more levels and such i will be sure to check it out.

Thanks for all the feedback I've made a *lightly* updated version fixing the issues with placing pieces and the cheat that @simplepotential found!

Very well-done and executed game! The concept is original yet simple and easy to grasp. I couldn't get past level five or so as I could not figure it out. Didn't run into any bugs. My one note is that I just had to assume the R to restart and knew click and drag from the GIF. Those two features could be a little more clear or even just mentioned in the description as I imagine new players not understanding those controls. Overall fantastic job!

Very challenging. Good job!

I love how simple and intuitive the concept is and yet the puzzles can be surprisingly hard! I only wish there were more puzzles. I see an awesome mobile game in the making. Keep working on this!

This game is hard as balls! in a good way

original, nice but hard as F

Great puzzle mechanic! Wish there were more puzzle elements. Very solid core gameplay loop.

This is a very well designed puzzle with levels to show it off. It was the right length for the number of moves I had. If you choose to expand it I'd next introduce a change-up of some kind like a different kind of environment tile or something that manipulates the overall tile state. This is a good, complete, solid entry. Well done.

Great puzzle game!

Nice game! I'm always a sucker for a good puzzle. Only thing I could say to improve is expand on what you already have.

Seriously clever little puzzle game. I was actually really sad when I'd finished all the levels though, I wanted more. These can't be fast to design though, great job. Good puzzles are tough to get right.

I loved the simplistic look. Very tight gameplay mechanics. Would have loved more levels :P But i appreciate what you have done in 3 days time :)

Very cool idea that fit the theme well :)

Really nice little puzzle. It's clever, I haven't seen anything like it, and I can see how it might be expanded if you chose to do so. Nicely done!

NICE! But seriously, great and challenging level design.

Simple but enjoyable brainteasers. Would love to play something like this on mobile!