Great game! just want to point that you can pass the level 9 with just one of the boxs

There are so many gravity gimmick platformers like this (the most recent I can think of is Leap of Life Alone from last month) so you don't get a lot of points for originality. However, one thing I found to be pretty nice about this game is that you prevent players from pushing blocks up against walls so that they don't get stuck. Thanks for that :)

Hmm, quite the neat puzzle platformer you got here! It's a little bit bland due to simple graphics and a lack of music, but nevertheless it feels decent and it provides a short and sweet adventure: it tutorializes intuitively through level design, has a decent set of mechanics to utilize, and it escalates the challenge in satisfying manner. It even has some cute touches like the way the arrow blocks first get introduced, what with the way they crash in from off-screen!

That said, while I did have fun and made it all the way through, it was a bit rough in some areas, apart from the issues mentioned previously:

*The symbols that the game uses to build a language and teach mechanics were a bit off in some cases. For example, the exit door looks more like it is closed when it is open, due to the stripes giving it a glass window feel: feels like those sprites should be reversed! There was no way to distinguish between buttons that need to be weighed down or ones that only need to be pressed once: feel like you should use a switch or lever graphic for the buttons that don't need to be weighed down to indicate this. You also setup the fact that boxes with X's on them don't get influenced by gravity switches, but boxes with arrows do, then suddenly you introduced boxes with X's on them but also with yellow to indicate that they do get influenced? Why not just use the arrow symbols like you were already using before? Using yellow makes me think they need to interface with yellow doors or buttons!

*The physics of the game can be a bit wonky: I had a level take more time than necessary because a box I pushed down from a ledge would end up getting too close to another nearby box and I couldn't separate them. Even when they were stacked on top of each other they wouldn't separate: why couldn't I just push the top one off?

*Level 13 was an very awkward difficulty spike: for a game that has been very simple so far, suddenly the level required you to do some very tight and precisely timed gravity-switching and physics to pull off the solution. It just felt like it came out of left field: I had no idea the puzzles would require this kind of dexterity based on the previous ones! Even though I liked this puzzle and the others after it, it definitely feels like there needs to be a better build-up as it really caught me off-guard.

*Bit disappointed that there was no save feature so I could come back to finish after a little break, or at least a level select...oh wait, there is a level select, but it only appears after you beat the game when it is no longer necessary! I would much prefer the level select be there at the start so you can pick up where you left off, or maybe even skip a puzzle you can't solve.

Great game until level 13. I just can't figure out the jump and reverse gravity magic with this level. Even after looking at a walkthough, I'm stumped. I guess it's a timing thing. Overall, excellent game. And I would love it if there were even more levels! Well done.
Thanks!

I liked it until my browser crashed with "this webpage was reloaded because it was using significant memory".

And there was no save. It was fun though.