It took me a while to figure out how the game was supposed to control, but once I did, it was a pretty interesting concept with good puzzles! However, the levels need to be designed a bit more carefully. I got into two softlocks, and the second one made me quit. First one is if you get into the position shown in my screenshot, where it seems to be impossible to progress anymore. The next one happens if you exit the 3rd room to the left without using the cube (which is possible), as you become unable to pick up the cubes in the next room and get stuck there forever as the red car and can't get the coins. It also seemed like there may have been some coins you can permanently miss if you make the wrong move, which I'm not the most fond of. When designing puzzle games like this, you gotta be REALLY careful about those softlocks.
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oh. I found a 2nd combination that get you stuck on the 2nd map. Removing the bottom left one seems to fix it. Torn between adding a restart button as an easy way out, or test every combination so you cannot softlock yourself. Also, if you leave the 3rd map without the red block, you still can move to the next area, but having the red block do make it a lot easier.