Very simple but fun, it kept my interest until the end. Almost all puzzles have a logical solution and they don't get too difficult or annoying.
I will also post a walkthrough in case anyone has trouble with it, but I suggest trying everything yourself first.
Level 1: Just click on the ball in the left area of the level, then immediately go up until you reach the blocked passage. Click on it to pass through along with the ball.
Level 2: Go to the round room with the square and click on it, it will show you the solution of the puzzle. Find the square on the bottom of the level and click on it until they become 4. Do the same for the circle (you need 2) and triangle (you need 3).
Level 3: You can click on the symbol on the upper part of the level to change the location of the spiked barrier. Go all the way down and left to find a rectangle that's actually the barrier that keeps the square above trapped. You can tell when it hits on it because the bumping sound is different and the rectangle moves a little. You have to click on it just before that happens. Now go up and change the placement of the spiked barrier, then click on the freed square and follow it to the exit.
Level 4: Click on the walls to make some rectangles appear, you have to click on all of them fast or they will return to their original position, each on a different timer. The order is: upper left, bottom left, bottom right, middle left, upper right. (you may find it easier to click on the middle left first, then the bottom right)
Level 5: Click on the circle until it fills the screen, then find an invisible triangle near the upper right of the screen and another near the bottom left (you can also move the mouse pointer around the screen, it should change if the area is clickable). After they form a line, find the circle around the bottom left of the screen and use the path it opens to move all the way down. If you go right you will find a square you have to click, but if you go left first you can see some moving white spikes. They are actually pointing at it. From the split path, go up and right to find more spikes. They are pointing up and left, towards the location of the next square you have to click, so go left and up to find it. The next is on the upper right corner of the level and the final one on the upper left. Follow it upwards until you reach a wall. To find the exit you have to move to the bottom left corner of the new area and from there, move up once and click on the left wall (You can also find a map near the upper left corner of the level).
For the final puzzle, you will have to click on the squares when they stop moving (they will make a different sound). The location will always be the same so you can easily beat the level by memorizing them: The first square will stop near the bottom left corner of the screen. The 2nd up and left of the first. The third left and a bit up of the first. The 4th near the upper right corner of the screen and the 5th up and a bit left of the 3rd.