What a fun game. It such a weird concept and somehow you made it work seamlesly. It is rather tricky to get th ehang of it, but evetually I did. Much fun :D
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Making it work seamlessly and making it feel natural was certainly a challenge, if you're curious about how it works, the player has 2 scales, the actual scale and the movement scale, the actual scale is what you control with the space bar and affects the size and hitbox of the player, the movement scale affects speed, gravity and acceleration. The game only updates the movement scale when you're on the floor or touching a wall.
Another fun fact is that there's 2 copies of the background, one of them scaled down, and i crossfade between them as you scale up or down, you can spot that happening if you look cosely.