Nice game, congratulations on your first jam ^_^ I really liked the art and the music, and the concept of drawing lines to make new walls and floors instead of directly moving the character with the controls is so fun!
One thing I didn't really get the point of is the planning phase. You can't use it to prepare your lines beforehand anyway, so in the end I always ended up just restarting the level when I'm done thinking spamming space so the level starts. I get that I'm kind of cheesing the mechanic and adding a death to the counter, but I feel like it would make more sense if you were allowed to draw lines while planning.
Fun game overall, good job!