I like the game's design, and as a beta, this looks very nice. I would suggest adding some coins and enemies though. Maybe a time limit on each level as well. The only really bad thing I noticed was an error about the falldetector not being defined.

very interesting player movement

Hey! If it's your first game, it's not really bad, there are things that have interested me, such as the fact that the blue box is not the same as the other boxes in terms of movement (it seems to me that it is not yet fully programmed) however, I would not call this even beta, I consider it more like still in alpha due to the number of errors it has and with the art and music that could be improved. The spikes have a texture issue that makes them look like a line of pixels next to them. The music is not the strong point of the game either, although you could improve the music (it seems to me that you are using beepbox) you could see some tutorials on how to make music in beepbox to improve yours. Anyway, thanks for making the game, if this is really your first project I congratulate you and I wish you the best for your next projects.

there are some bugs but overall the game is good

best gaem evor!!