Musical Art run is a fun game I made in just 2 days. You play as the grey square that whenever it moves it leaves a colorful trail behind it. As you move you also will emit a musical sound where the instrument and note depend on the color you left behind. Use the up and down arrow keys to move, well, up or down. Use the left and right arrow keys to change direction as you never stop moving, unless you hit a wall, though those make you bounce off of them. There are 4 colorful squares that all erase whatever bit of the colorful trail you made they touch, each have their own unique behavior. The Purple square just bounces off of walls. The red square also bounces off of walls but randomly changes direction. The cyan square acts like the purple square but teleports randomly to a random spot. The green square also teleports to random spots, but chases you, if you touch it it teleports to a random spot. There also are 3 different 'events' that can happen. The 1st event causes your line of sight to be limited for 10 seconds, but you are faster during this time. The 2nd lets you destroy the white square walls for 10 seconds, but you are slower during this time. The 3rd event makes all the white square walls go away and your speed is randomly slow or fast during this time, after the 10 seconds, the walls come back with a different layout. Be warned though, you can get stuck!
Thanks to Scratch for music blocks and pen blocks and all the other blocks needed. Ultrabox for the ability to make the sound effects I wanted.